Cold Brew Coffee: What It Is, How to Make It, and Why the Bean Matters

Cold brew is coffee steeped in cold water for 12 to 24 hours, and it's one of the smoothest, least acidic ways to drink coffee. You don't need special equipment, just coarsely ground coffee, water, a jar, and time. The bean you start with makes all the difference. This guide covers everything: what cold brew actually is, how it differs from iced coffee, a simple step-by-step recipe, and how to pick the right coffee for the best result.

Cold Coffee Culture in Greece

Greece has one of the most passionate cold coffee cultures in the world. We've been drinking frappés and freddos in the summer heat for decades. But cold brew is something different entirely. It's not iced coffee. It's not a trendy repackaging of something you already know. It's a completely different brewing method, and once you try it made with the right beans, it's hard to go back.

Cold brew coffee is showing up everywhere right now, from coffee shops in Athens to online orders shipped across Greece. And for good reason. It's smooth, naturally sweet, and easier to make at home than most people expect. Whether you've never tried it or you've only ever bought it ready-made, this guide will show you exactly how it works and how to make it yourself.

What Is Cold Brew Coffee, Exactly?

Cold brew coffee is made by steeping coarsely ground coffee in cold or room-temperature water for 12 to 24 hours, then straining out the grounds. No heat is used at any point. The result is a smooth, concentrated coffee that's lower in acidity and naturally sweeter than hot-brewed coffee.

The key difference from regular iced coffee is the brewing method. Iced coffee is brewed hot and then poured over ice. Cold brew never gets hot at all. Because cold water extracts coffee more slowly than hot water, fewer bitter and acidic compounds are released, which is why cold brew tastes so much gentler on the palate. It's a method built on patience rather than heat.

The final product is usually a concentrate. You dilute it with water, milk, or plant-based milk before drinking. That gives you full control over the strength of every cup.

Why Cold Brew Is Having a Moment in Greece

Greece has always loved cold coffee. But specialty cold brew is a newer chapter in that story, and it's growing fast.

The Greek coffee market is worth over €3 billion in 2025, and one of the clearest trends driving it is the rise of cold brew. Statista notes that as Greek consumers develop a stronger appreciation for quality and specialty coffee, cold brew is becoming a preferred choice for its smooth, less acidic taste profile.

Globally, the numbers back this up. The cold brew market grew 22% between 2023 and 2024 alone, and it's now valued at over $3.24 billion worldwide. According to a 2024 Datassential survey, roughly 27% of coffee drinkers reported drinking more cold brew than they did a year earlier, driven by better flavors, easier availability, and a shift away from sugary drinks.

For Greek coffee lovers, this feels like a natural evolution. We already understand that coffee is worth taking seriously. Cold brew just takes that one step further, bringing out the best in quality beans in a format that suits our climate perfectly.

What Coffee Should You Use for Cold Brew?

The best coffee for cold brew is freshly roasted, coarsely ground, and either a medium or medium-dark single-origin bean. Light roasts can work, but medium and darker roasts extract more body and richness during the long, cold steep.

Fresh beans make the biggest difference. Stale coffee will taste flat or bitter no matter how you brew it, but cold brew is particularly unforgiving of poor-quality beans because the low-temperature extraction has no way to hide dull flavors.

Single-origin coffees shine especially well in cold brew. Ethiopian beans, for example, have natural fruit and floral notes that come through beautifully in cold extraction. At Three Lines Coffee, our cold brew collection uses hand-picked Ethiopian beans selected for their smooth, tropical, and sweet character. Cold water pulls out those fruity notes without the harsh edges that hot brewing can sometimes add.

If you want to explore further, our Colombia-Villa Alba is another single-origin worth trying for filter brewing and cold applications. And if you're looking for an everyday espresso bean with balanced sweetness, the Guatemala - La Palma is built to stay delicious whether hot or iced.

The short version: start with the best beans you can find, grind them coarse, and brew fresh.

How to Make Cold Brew Coffee at Home - Step by Step

Making cold brew at home takes about five minutes of actual effort and 12 to 24 hours of waiting. You don't need a fancy cold brew maker. A mason jar, a coarse grinder, and some cheesecloth or a fine mesh strainer are all you need.

Here's the process from start to glass:

What you need:

• 125g coarsely ground specialty coffee
• 1 litre of filtered cold water
• A large jar or container with a lid
• A fine mesh strainer and cheesecloth (or a paper coffee filter)

Step 1: Grind your coffee coarsely. Aim for a texture similar to coarse sea salt or a French press grind. A grind that's too fine will over-extract in cold water, producing a bitter, muddy result.

Step 2: Combine coffee and water. Use a 1:8 ratio: 1 gram of coffee per 8 grams of water. For 1 litre of water, that's roughly 125g of ground coffee. Stir gently to make sure all the grounds are wet.

Step 3: Steep for 12 to 24 hours. You can leave it at room temperature or in the fridge. Steeping in the fridge is safer for food hygiene and produces a slightly cleaner flavor. Twelve hours gives you a lighter result, 24 hours gives you something richer and more concentrated.

Step 4: Strain. Pour the cold brew through your strainer lined with cheesecloth or a paper filter into a clean container. Go slowly. This removes the grounds completely.

Step 5: Dilute and serve. Your strained cold brew is a concentrate. Dilute with equal parts water or milk for a regular-strength cup, or go 2:1 (cold brew to water) if you want it stronger. Serve over ice.

Cold brew concentrate keeps in the fridge for up to a week. Most people find the flavor is best in the first three to four days.

Cold Brew vs. Iced Coffee: What's the Difference?

Cold brew and iced coffee are not the same drink. Cold brew is steeped in cold water for 12 to 24 hours and never exposed to heat. Iced coffee is brewed hot and then cooled down or poured over ice. That difference in brewing method creates a completely different cup.

Cold brew is smoother, less acidic, and naturally sweeter and fuller-bodied. The cold extraction process draws out fewer of coffee's bitter compounds, which is why it's often preferred by people who find regular coffee too sharp or hard on the stomach. Iced coffee retains more acidity and brightness, which can be appealing with certain light-roast single-origins, but is much more dependent on the quality of the hot brew.

Cold brew also keeps much longer. A fresh cup of iced coffee needs to be drunk quickly before the ice dilutes it. Cold brew concentrate in the fridge is ready whenever you are, for days at a time.

For Greek coffee lovers already comfortable with the freddo espresso, cold brew offers something with more depth and less dependency on the espresso shot itself. The flavor comes from the long steep, not from a fast extraction.

Common Cold Brew Mistakes (and How to Fix Them)

Cold brew is forgiving, but a few mistakes come up repeatedly. Here's what to watch for.

Grinding too fine. This is the most common problem. Fine grounds over-extract during the long steep and produce a bitter, harsh result. Always use a coarse grind, similar to what you'd use for a French press. A grind that's too fine will cause over-extraction even in cold water; it just takes longer to notice.

Using stale beans. Cold brew can't rescue old coffee. The slow, cold extraction highlights the natural characteristics of the bean, including flat or papery notes from stale grounds. Buy fresh-roasted beans and grind just before brewing.

Using tap water. Heavily chlorinated tap water will affect the taste. Use filtered water for a cleaner, more balanced cup.

Not steeping long enough. Under 12 hours, and the cold brew will taste weak and watery. Steep for at least 12 hours and up to 24. If you forget about it and it goes a few hours over, don't worry. Cold brew is one of the most forgiving brew methods around.

Drinking the concentrate straight. Cold brew concentrate is very strong. Always dilute it before drinking, usually 1:1 with water or milk.

Skip the Wait: Try Our Ready-Made Cold Brew

If you love the idea of cold brew but don't want to wait 24 hours on your first attempt, we've done it for you. Our cold brew collection is made from hand-picked Ethiopian beans selected for their smooth, fruity, and tropical notes. It's the same quality you'd make at home with great beans and a long, patient steep, just ready when you are.

We ship across Greece, so whether you're in Athens, Thessaloniki, or anywhere in between, specialty cold brew can be at your door in a few days. And if you're local to Argyroupoli in South Athens, come visit us at the café. Cold brew is on the menu alongside our full range of specialty coffees and fresh pastries.

If you're a café or hospitality business curious about stocking our coffees, get in touch about wholesale. We work with businesses that take coffee as seriously as we do.

And if cold brew inspires you to explore more brewing formats, our Costa Rica San Diego is a great way to brew a clean, high-quality filter coffee with zero equipment required.

The Short Version

Cold brew is simple, smooth, and well worth making at home. You need good beans, a coarse grind, cold water, and patience. The quality of your starting material matters more than any piece of equipment you buy.

Start with fresh specialty coffee. Use a 1:8 ratio. Steep for 12 to 24 hours in the fridge. Strain, dilute, and drink over ice.

If you want to start with beans, we know they work beautifully in cold brew. Explore our cold brew collection and order online anywhere in Greece. And if you want to skip the setup entirely while you wait for your beans to arrive, grab a ready-made cold brew from us and taste what the right Ethiopian single-origin can do in a cold steep.

Good coffee doesn't have to be complicated. It just has to start with the right beans.

FAQ's

How long does cold brew coffee last in the fridge?

Cold brew concentrate keeps well in the fridge for up to seven days when stored in a sealed container. The flavor is typically best in the first three to four days after straining. After that, it stays safe to drink, but can lose some of its brightness. Always store it covered and away from strong-smelling foods.

Can I use any coffee beans for cold brew?

You can technically use any beans, but quality matters a lot. Medium to medium-dark roast single-origin beans tend to work best because they extract good body and sweetness during the long, cold steep. Stale beans or very finely ground pre-ground coffee will produce a flat or bitter result. Freshly roasted, coarsely ground specialty coffee gives you the smoothest, most flavorful cold brew.

Is cold brew stronger than regular coffee?

Cold brew concentrate is significantly stronger than a regular cup of drip coffee, because it's brewed at a much higher coffee-to-water ratio. However, once you dilute it (typically 1:1 with water or milk), the caffeine content per cup is similar to hot-brewed coffee. The strength depends on your steep ratio and how much you dilute. Cold brew is not inherently higher in caffeine if you dilute it properly.

Do I need special equipment to make cold brew at home?

No. A large mason jar or any sealable container works perfectly well as a brewing vessel. For straining, a fine mesh sieve lined with cheesecloth or a paper coffee filter is all you need. A kitchen scale is helpful for measuring your coffee-to-water ratio accurately, but measuring cups work too. A burr grinder to achieve a consistent coarse grind will make a noticeable difference in quality, but even a blade grinder on its coarsest setting is better than using pre-ground coffee.

Where can I buy specialty coffee for cold brew in Greece?

Three Lines Coffee ships freshly roasted specialty coffee across Greece, including single-origin coffees that are excellent for cold brew. You can order online and have it delivered to your door. If you're in South Athens, you can also visit our café in Argyroupoli to pick up beans and try cold brew in person. For ready-made cold brew using Ethiopian single-origin beans, our cold brew collection is available online at threelinescoffee.com.