What Is Cold Brew Coffee and How Is It Made?

You ordered cold brew expecting iced coffee. The drink that arrived tasted completely different. Smoother, sweeter, less acidic. Like a different beverage entirely.

That is because cold brew is not just cold coffee. The brewing method creates a fundamentally different drink.

Cold Brew vs Iced Coffee

These terms get confused constantly. The distinction matters.

Iced Coffee Explained

Iced coffee is regular hot-brewed coffee served cold:

• Coffee brews with hot water (90 to 96°C)

• Brewed coffee cools or pours over ice

• Same extraction process as hot coffee

• Same flavour profile, just cold

Ice dilutes the brew, so iced coffee often tastes watered down unless brewed stronger initially.

Cold Brew Explained

Cold brew never touches hot water:

• Coffee steeps in cold or room temperature water

• Steeping takes 12 to 24 hours

• Extraction happens slowly without heat

• Result is concentrate often diluted before serving

The temperature difference changes everything about how flavours extract.

How Cold Extraction Works

Heat accelerates extraction. Without it, the process changes fundamentally.

What Hot Water Does

Hot water extracts coffee compounds quickly:

• Acids release early

• Oils dissolve readily

• Bitter compounds extract with extended contact

• Total time: 2 to 5 minutes for most methods

Heat gives you everything coffee contains, including elements you may not want.

What Cold Water Does

Cold water extracts selectively:

• Acids extract slowly and incompletely

• Oils stay largely in the grounds

• Bitter compounds remain mostly unextracted

• Total time: 12 to 24 hours for full development

Cold brew produces a different chemical profile than hot brewing. Lower acid, smoother flavour, naturally sweeter taste.

The Taste Difference

Cold brew's extraction profile creates a distinctive drinking experience.

Reduced Acidity

Studies suggest cold brew contains significantly less acid than hot-brewed coffee from the same beans. Drinkers report:

• Smoother, gentler flavour

• Less bite or sharpness

• Easier on sensitive stomachs

• Naturally sweeter without sugar

For people who find regular coffee too acidic, cold brew often solves the problem.

Concentrated Flavour

Cold brew is typically made as concentrate:

• Higher coffee-to-water ratio during steeping

• Diluted to drinking strength when served

• Intense coffee flavour without harshness

• Chocolate and caramel notes often dominate

Single origin coffees with chocolate and fruity profiles particularly shine in cold brew.

What Gets Lost

Cold extraction also leaves things behind:

• Bright, fruity acidity diminishes

• Delicate floral notes may disappear

• Complexity can flatten

• Origin character becomes less distinct

Coffees prized for bright acidity and complexity may underwhelm as cold brew. The method suits different beans than pour over or espresso.

Basic Cold Brew Method

Making cold brew at home requires no special equipment.

Equipment Needed

• Container (jar, pitcher, or dedicated cold brew maker)

• Coffee grounds (coarse grind)

• Cold or room temperature water

• Strainer and filter for finishing

Ratio Guidelines

Standard concentrate ratio:

• 1 part coffee to 4-6 parts water by weight

• Example: 100g coffee, 450g water

• Dilute concentrate 1:1 with water or milk when serving

For ready-to-drink strength, use 1:8 or 1:10 ratio and skip dilution.

Steeping Time

• Minimum: 12 hours for noticeable extraction

• Optimal: 16 to 20 hours for full flavour development

• Maximum: 24 hours before over-extraction risks

Room temperature steeps faster than refrigerator temperature. Adjust time accordingly.

Straining Process

After steeping:

• Pour through a fine mesh strainer to remove grounds

• Filter through paper filter or cloth for clarity

• Store concentrate in refrigerator

• Lasts 1 to 2 weeks refrigerated

Cold Brew Concentrate vs Ready to Drink

Understanding the difference prevents confusion.

Concentrate

• High coffee-to-water ratio during brewing

• Strong, intense flavour

• Must be diluted before drinking

• Versatile for various serving styles

Ready to Drink

• Lower ratio produces drinking strength directly

• No dilution needed

• Simpler but less flexible

• What most cafés serve

If making concentrate, dilute to taste. Starting too strong is easy to fix. Starting too weak requires re-brewing.

Best Beans for Cold Brew

Not all coffees suit cold brew equally.

What Works Well

Cold brew favours:

• Medium to medium-dark roasts

• Chocolate, caramel, and nutty flavour profiles

• Coffees with lower natural acidity

• Indian single origins with spice and chocolate notes

What Works Less Well

Cold brew may underwhelm with:

• Very light roasts

• Coffees prized for bright acidity

• Delicate floral or tea-like beans

• Complex fruity Ethiopians

These coffees are better showcased through pour over or other hot methods.

Serving Suggestions

Cold brew concentrate offers flexibility.

Classic Iced Cold Brew

• Fill glass with ice

• Add cold brew concentrate

• Top with water to taste

• Stir and enjoy

Cold Brew with Milk

• Reduce or skip water dilution

• Add milk or cream to taste

• Naturally sweet, often needs no sugar

Warm Cold Brew

Strange as it sounds, heating cold brew produces mellow hot coffee:

• Dilute concentrate with hot water

• Results taste smoother than hot-brewed

• Good option when you have concentrate but want hot coffee

Black Pole Coffee for Cold Brew

At Black Pole Coffee, our single origin coffees with chocolate and spice notes make excellent cold brew. Source beans roasted for versatility across brewing methods. For convenience without the wait, try our drip bags when time is short.