Summer Cold Brew Coffee Making Method! Super Simple Iced Coffee Recipe Tutorial with Illustrations

Here's what happened: last time, a customer who came into the shop tasted the coffee FrontStreet Coffee made and asked, "Boss, is your cup not clean? Otherwise, why is this coffee so sweet?" That startled FrontStreet Coffee into jumping up and making the customer another cup. It turned out the coffee's sweetness was so pronounced that it created the misunderstanding that the cup had been dirty and the coffee had picked up leftover sugar!

Absurd as it sounds, it really happened. Still, many beginners struggle to make sense of "sweetness" in coffee. After all, every time they order what the barista calls a "high-sweetness coffee," what arrives is a black coffee that is either bitter or sour — they can't taste any sweetness at all, and those two flavors only make them wince. So today, FrontStreet Coffee wants to explain where the sweetness in coffee actually comes from.

Is It Related to the Sugars in the Coffee Beans?

When you hear "sweetness," you naturally think of sugar. Green coffee beans contain monosaccharides, disaccharides, and polysaccharides, which together account for roughly 50% of the bean's weight. But not all of these sugars are sweet!

Polysaccharides, for instance, have no sweetness and don't dissolve in water, yet they make up the largest share of the bean — they are the cellulose of the coffee bean, better known to us as coffee grounds. Monosaccharides, by contrast, are both water-soluble and sweet; glucose and fructose belong to this group. Disaccharides form when two monosaccharide molecules join with the loss of water; they are also water-soluble and sweet, and sucrose, maltose, and lactose all fall into this category.

But the sweetness you taste in coffee does not come directly from these sugars. During roasting, the compounds in the bean constantly react with one another, breaking down and recombining into ever more diverse flavor compounds. The sweet monosaccharides and disaccharides are no exception — they keep reacting throughout the roast, and by the time the beans leave the roaster only trace amounts of perceptible sugar remain. Some survives, but so little that our taste buds simply can't register it. So we can't perceive sweetness through those sugars directly.

So Where Does the Sweetness Actually Come From?

Since the actual sugars are scarce or gone, and taste buds alone can barely detect them, our perception of sweetness doesn't rest on taste alone — it needs help from our other senses, especially smell.

Smell works through two channels: orthonasal and retronasal olfaction. Orthonasal olfaction is when you inhale aromas directly — the dry fragrance and wet aroma you evaluate in coffee are picked up this way. Retronasal olfaction happens while drinking: as you swallow, coffee aromas travel up into the nasal passages, and what you perceive at that moment comes through retronasal olfaction. When the brain combines the tastes in your mouth with the aromas caught by your nose, it automatically conjures the flavor of a specific food from memory.

If that particular aroma reminds you of something sweet, you will instinctively judge the coffee as very sweet. For example, if roasting transforms compounds in the coffee into aromas resembling toffee or brown sugar, then once you've caught those aromas and merged them with the coffee's taste on your palate, you form the corresponding perception of sweetness. That is exactly what baristas mean when they talk about sweetness.

How Can You Train Your Ability to Perceive Sweetness?

Drinking more coffee is always FrontStreet Coffee's top recommendation — but simply drinking a lot won't bring dramatic improvement, so a few little tricks help. Before tasting, build a first impression from the coffee's dry fragrance and wet aroma, since aromas are strongest at that stage; take them in first. Then, when you sip and swallow, keep your mouth closed and exhale through your nose so retronasal olfaction can do its work. When taste and aroma line up, the sweetness will surface easily.

One caveat: your own imagination can box you in, because coffee aromas are always similar to but never identical with the everyday foods you know. So bring a friend to taste and analyze together. Even if you catch nothing specific, your friend might — and with their input you'll quickly connect the aroma to a food and perceive the coffee's sweetness.

FrontStreet Coffee Recommendation

Cold brew amplifies a coffee's floral and fruity character while softening woody and roasted notes, so light-to-medium roasts show their qualities best in this method.

FrontStreet Coffee Strawberry Candy Gesha Blend: Gesha is world-famous for its classic florals and clean fruit acidity. This blend marries the most representative Panama Gesha with a Costa Rican honey-processed coffee: the former contributes delicate rose and orange, the latter brings the sweet character of grape, dried blueberry, and strawberry candy, building rich layers of flavor. As cold brew it is sweet-tart, lively, and uplifting — and if you let it ferment and settle briefly, it takes on a wine-like mouthfeel.

FrontStreet Coffee Natural Huajuan: If you want an iced coffee with standout florals, Huajuan is the one. It comes from Ethiopia, the birthplace of coffee, and because it is naturally processed the beans absorb abundant sweet aromatics from pulp and skin. Brewed as cold brew, it shows magnolia, creamy strawberry, dried mango, guava, and black tea notes.

FrontStreet Coffee Kenya Cherry Tomato: For a cold brew with full juice-like texture, start here. The sweet-tart tones of cherry tomato, snow pear, black plum, and dried dark plum come through vividly under cold extraction, with low bitterness, full acidity, and a refreshing finish over ice. Grown in Thika, Kenya, from the carefully selected SL28 and SL34 varieties, the lot carries complex berry aromatics and uses the region's distinctive K72 double-washed process; a medium-light roast converts the precursor aromatics into layered fruit character.

FrontStreet Coffee Colombia Sidra + Costa Rica Tarrazu: Cold brew uses more grounds than pour-over, so rather than pricey top-grade beans, choose affordable everyday coffee — or blend for both flavor and value. Many people love the passion fruit, grape, apricot, and dried-fruit sweetness of FrontStreet Coffee's Colombian Sidra but find it costly on its own; adding FrontStreet Coffee's Costa Rica Tarrazu at a 1:2 ratio gives you the Sidra's florals and fruit plus Tarrazu's crisp citrus acidity, at a friendlier price.

FrontStreet Coffee Ethiopia Yirgacheffe Worka Cooperative: As the most iconic African coffee, Yirgacheffe has won over countless drinkers with its rich florals and fruit tones. The washed version brings a clean, bright sweet-tart cup, an everyday price, and wide versatility — pour-over, siphon, French press, and cold brew alike — making it a first choice for home brewers. FrontStreet Coffee's Worka lot is among the most representative washed Yirgacheffes: excellent quality, and superb for cold brew, showing very sweet berry notes, layered structure, and honey.