How to Make Cold Brew Coffee at Home: Methods, Water-to-Coffee Ratios, Step-by-Step Guide, and Flavor Profile Characteristics

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As summer arrives, cold brew coffee becomes one of the most discussed topics among coffee enthusiasts, and everyone shares their insights and experiences when making it. Why has cold brew become so popular in the coffee community in recent years? What is the difference between cold brew coffee and ordinary iced coffee? In this article, FrontStreet Coffee explores this fascinating cold-brewed coffee.

What is Cold Brew/Cold Brew Coffee?

Cold brew coffee is pure black coffee liquid made by steeping coffee grounds directly in water at room temperature or at low temperature for an extended period. Because the extraction is cold, the flavor releases from the grounds far more slowly than it does at high temperature. The steeping time therefore usually runs somewhere between 8 and 16 hours, depending on the room or refrigerator temperature. Since it requires no special technique and no complicated brewing equipment, you can make an iced coffee with a distinct aroma and a rich body, and steeping it overnight to enjoy in the morning has become a favorite routine for many working professionals.

What's the difference between room temperature and low-temperature cold brew coffee?

Cold brew made at room temperature should not be steeped for more than 8 hours, while cold brew made at low temperature is best steeped for 12 to 16 hours.

Room-temperature cold brew extracts at a rate that shifts with the ambient temperature. Coffee steeped at room temperature can express richness immediately once extraction is complete, but the drawback is that it easily picks up woody flavors. The benefit of refrigerating is that you get that richness while woody flavors are less likely to appear, but the drawback is that it really does take a long time.

What coffee beans are suitable for making cold brew coffee?

The liquid cold brew produces does not have the clarity of cold-drip coffee and carries a thin layer of oil floating on the surface, which gives it a slightly heavier and more balanced flavor profile. FrontStreet Coffee recommends choosing coffee beans with noticeable acidity or a rich aroma for cold brew. FrontStreet Coffee's Sherry coffee beans, FrontStreet Coffee's Mozart coffee beans, FrontStreet Coffee's Yirgacheffe Natural Red Cherry coffee beans and FrontStreet Coffee's Kenya coffee beans, for example, are all cost-effective single-origin coffees suitable for cold brew.

If you prefer a sour-and-sweet cold brew, FrontStreet Coffee recommends three premium beans: Guoding Ding, Strawberry Candy and Flower Queen, which carry rich fruit aromas and present delicate sweet-and-sour flavors under low-temperature extraction. If you prefer a balanced cup, FrontStreet Coffee recommends Diamond Mountain, Kaffa Forest and Gesha Village Chaka, which offer a good balance of acidity, bitterness and sweetness.

The Correct Way to Make Cold Brew Coffee

FrontStreet Coffee recommends making cold brew in a low-temperature refrigerator environment, especially in southern regions where room temperatures climb quite high in summer. If you make cold brew at room temperature, the steeping time is difficult to control properly.

Cold brew coffee brewing parameters: a 1:10 coffee-to-water ratio, a grind size passing through a Chinese standard #20 sieve (0.85mm holes) at a 75% rate, and ice water for steeping. When making cold brew, FrontStreet Coffee uses 50 grams of coffee grounds, adds 400ml of filtered water and 100 grams of ice, mixes well, then seals the bottle and places it in the refrigerator's cooling compartment. Low-temperature extraction for 12 to 16 hours is recommended, and it should not exceed 16 hours (it easily becomes over-extracted and develops off-flavors). Once steeping and extraction are complete, simply filter out the coffee grounds with a filtration device.

The Correct Way to Drink Cold Brew Coffee

FrontStreet Coffee suggests placing the extracted cold brew in the refrigerator for 2-3 hours before drinking, because during that overnight resting process the coffee liquid becomes fully mellowed as time passes, which results in a better flavor.

How Long Can Cold Brew Coffee Be Stored?

After filtering, cold brew coffee can be sealed and stored in the refrigerator for up to 5 days. Although cold brew becomes richer the longer it is stored, the refrigerator environment is "complex" (especially in a household fridge), which makes it difficult to avoid bacterial invasion completely, and every time you open the bottle, air has a chance to get in. For everyone's health, therefore, FrontStreet Coffee does not recommend storing it for a week or even a month before drinking.

FrontStreet Coffee Recommendation

Cold brew concentrates sweetness and fruit while suppressing roast and woody notes, so light and medium roasts built on fruit and flowers perform best. FrontStreet's Strawberry Candy Gesha blend combines two of the most recognizable profiles in coffee: a Panama Gesha that contributes delicate rose and orange, and a Costa Rica honey-process coffee that brings grape, raisin and strawberry-marshmallow sweetness, and FrontStreet gives the blend a medium roast so that both sides show through. Steeped cold, it is sweet-sour and lively, and if you let it ferment and settle a little longer it takes on a fruit-wine quality. If you want florals to lead, FrontStreet's natural Huakui comes from Ethiopia, the birthplace of coffee; because it is dried as a natural, the beans absorb a great deal of sweetness from the pulp and skin, and in cold brew it shows magnolia, cream strawberry, dried mango, guava and black tea. For a cup that is all juice, FrontStreet's Kenya Little Tomato is grown from the SL28 and SL34 varieties in Kenya's Thika region and processed with the local 72-hour double washed method, which pushes its cherry tomato, pear, black plum and smoked plum acidity to the fore; the bitterness stays low, and over ice it is especially refreshing. If cost is a concern, blend FrontStreet's Colombia Sidra one-to-two with FrontStreet's Costa Rica Tarrazú: you keep the passion fruit, grape and apricot sweetness of the Sidra alongside the fresh citrus acidity of the Tarrazú while spending far less per batch.

Because cold brew uses more grounds than a pour-over, keep the ratio generous—1:10—and work with ice water rather than water straight from the tap. Combine 50g of grounds with 400ml of filtered water and 100g of ice, seal the container, and leave it in the refrigerator for 12 to 16 hours; filter it, then let the liquid rest another 2-3 hours before you drink, and the cup will be sweeter and rounder than one taken straight from the filter.