What is Cold Brew Coffee? How to Make It, Flavor Profile, and Which Coffee Beans Are Best?

In recent years, pushed hard by the specialty coffee industry in Europe and America and by Starbucks, cold brew coffee has become the star of the iced-coffee world. On a scorching summer day you can enjoy a cup at a nice cafe — or make a batch at home, which has become a stylish and pleasant new coffee ritual. How is cold brew different from ordinary iced coffee? In this article, FrontStreet Coffee explores the charms of cold brew.

Understanding Cold Brew Coffee

Unlike hot-water extraction, cold brew steeps coffee at low temperature, typically taking 8-12 hours — one reason it is often a limited item at many cafes. Because high heat never enters the picture, many heavy compounds in the grounds never release, so cold brew has noticeably less bitterness, astringency, and oil. But the long steep pulls out plenty of caffeine, and the slow extraction lends a faint fermented, almost boozy sensation: a little cold brew over ice can feel like sipping strong liquor, and drinking too much or too concentrated a brew can leave you dizzy.

Why Cold Brew Reduces Bitterness

Why does low-temperature extraction cut bitterness and astringency? Because cold water effectively suppresses the release of high-molecular-weight substances — the compounds behind bitterness and heavy body — while the much longer extraction time lets the light-molecular flavor compounds fully dissolve. Cold brew therefore presents a clean overall profile while keeping rich aroma and a full-bodied taste.

Precisely because cold water cannot pull out body substances, a cold brew without sweetness and acidity would be soulless. And since cold brew exposes bean quality clearly and unforgivingly, use high-quality, freshly roasted beans with distinct flavors or obvious sweetness and acidity. Every variety FrontStreet Coffee sells has been hand-selected more than twice, so you receive consistently good beans.

To keep beans fresh, FrontStreet ships every order within 5 days of roasting — the goal is for every coffee lover to start from the freshest possible state and experience how flavors evolve day by day.

The Growing Popularity of Cold Brew

Coffee sales used to dip in summer and climb again in autumn. Now cold brew drives a surge in demand through the hottest months, far outpacing other iced drinks — sales rise right along with the temperature. It has also brought in a brand-new audience: millennials, many of whom have made it their drink of choice.

Seeing that popularity, Starbucks launched its own cold brew line in 2015, then added nitrogen cold brew and a vanilla sweet cream cold brew to build more texture. Thanks to that rollout, far more people have discovered this divine summer beverage.

How to Make Cold Brew Coffee at Home

Because it takes so long to prepare, cafe cold brew is rarely cheap — so here is FrontStreet Coffee's home method (grab a notebook!).

Unlike hot extraction, low-temperature extraction needs a slightly coarser grind than pour-over. Why? Without heat to speed up molecular movement, solids clump easily: the finer the grind, the worse the clumping, and the coffee in the middle of each clump never fully extracts.

FrontStreet therefore recommends a grind slightly coarser than granulated sugar (but finer than powdered sugar) — about 70-75% passing a Chinese-standard #20 sieve. For 1-2 servings, use 30 g of coffee at a 1:13 ratio (add 390-400 g of ice water or cold water) in a clean, grease-free sealed container. Mix the grounds and water evenly, then refrigerate for 8-12 hours. When the steep is done, filter out the grounds completely for a cold brew that is clean overall yet full-bodied.

Recommended Coffee Beans for Cold Brew

FrontStreet recommends light roasts for cold brew. Ethiopian Yirgacheffe beans show citrus, white floral, honey, and tea-like flavors (FrontStreet's Natural Red Cherry or washed Gedeb); Kenyan beans show cherry tomato, dark plum, plum, and caramel (FrontStreet's Asalia). Costa Rican lots offer dried-fruit fermentation aroma, floral sweetness, and almond-cream flavors (FrontStreet's Strawberry Candy or Mozart). For something special, try FrontStreet's Honduras Sherry beans, with whiskey, vanilla cream, and caramel flavors.

FrontStreet Coffee Recommendation

Cold brew amplifies floral and fruity tones while muting woody and roasted notes, so light-to-medium roasts are the natural pick. For a juicy, fruit-forward batch, the FrontStreet Kenya Cherry Tomato is hard to beat: grown in Thika at 1550-1750 m from SL28 and SL34, K72 double-washed and roasted light, it pours out cherry tomato, snow pear, black plum, and dark plum acidity at full juice concentration — low bitterness, refreshing over ice, with a long fragrant finish.

If florals are your thing, choose the FrontStreet Natural Huakui: as a natural, the beans absorbed abundant sweetness from pulp and skin, and in cold brew it shows magnolia, cream strawberry, dried mango, guava, and black tea. The washed Yirgacheffe Gedingding from the Gedingding Cooperative is another everyday winner — clean, bright sweet-sour berry and honey flavors, budget-friendly, and versatile across pour-over, siphon, French press, and cold brew.

For something playful, brew the FrontStreet Strawberry Candy Gesha Blend — Panama Gesha's rose and orange sweetness married to Costa Rica honey-processed grape, dried blueberry, and strawberry-candy notes; cold-brewed it is sweet-tart and lively, and if you let it ferment and settle a little it takes on a fruit-wine character. And since cold brew consumes more coffee than pour-over, a smart budget trick is blending: pair 1 part of the prized Colombia Sidra (passion fruit, grape, apricot, dried fruit) with 2 parts of Costa Rica Tarrazu — you keep the floral-fruit complexity and crisp citrus acidity while stretching your beans much further.