Many friends want to brew a pitcher of icy, smooth cold brew at home, but many beans on the market have pronounced acidity that leaves people at a loss. In fact, cold brew uses a low-temperature, long-steep process that itself effectively suppresses the extraction of sharp acidity, making the coffee taste especially sweet and smooth overall. As long as you understand the extraction logic behind it and find the right bean type and parameters, you can whip up a cup of refreshing cold brew with no harsh acidity.

From an extraction standpoint, cold water dissolves coffee's aromatic compounds more slowly, so if you want a full-bodied taste, you need to balance extraction yield and strength. Grind size directly affects extraction efficiency; grinding too fine easily draws out woody, astringent notes, while grinding too coarse makes the whole cup taste weak. It is usually recommended to grind the coffee to uniform particles similar to coarse granulated sugar, which ensures the sweetness is fully released without easily drawing out unpleasant off-flavors.

In daily brewing, if the coffee tastes too thick or slightly astringent, it is often because steeping too long has led to an overly high extraction yield; at that point, just add some ice cubes or purified water to slightly adjust the strength and make the flavor go down smoothly. If it tastes weak with thin aroma, that is under-extraction; next time, try grinding a little finer, or make the coffee-to-water ratio stronger. Once you grasp the interplay between extraction yield and strength, you can dial the same bag of beans to a satisfyingly balanced state.

When choosing beans, also consider whether you prefer to drink it strong or light. If you usually like adding ice cubes or even mixing in milk to make a rich latte, you are suited to deep-roast-profile beans with high body and flavors that withstand dilution; if you are used to gulping it straight and pursuing a crisp, thirst-quenching taste, you are better off choosing medium-light roast single origins with abundant floral and fruity sweetness but gentle acidity, which under low-temperature extraction show a juice-like, pure and rounded texture.

For friends who do not accept sourness at all, Qianjie Queen's Estate and Qianjie Bird of Paradise are especially recommended. With these two beans under low-temperature long steeping, you can hardly perceive any annoying sharp acidity. Qianjie Queen's Estate carries rich roasted nut and dark caramel sweetness, and as cold brew it delivers a thick, silky texture like chocolate ganache; Qianjie Bird of Paradise shows the warmth of roasted malt and cream, with a very balanced overall performance.

If you like traditional nutty flavors, you can also choose Qianjie 2013 Natural Typica. After low-temperature extraction, this bean's brown sugar sweetness is especially vivid, and as a hot pour-over it is likewise balanced and gentle. For pour-over, take 15g of grounds, use a 1:15 coffee-to-water ratio and pour 225ml of water; first bloom with 30ml of water for 30 seconds, then pour in stages, keeping the total time around 2 minutes. The brewed coffee is full and smooth, with a sweet finish and no harsh acidity at all.

If you dislike sharp acidity but are captivated by rich aromas, try Qianjie Strawberry Candy Gesha Blend and Qianjie Mozart. These have undergone refined processing, and the green beans themselves carry complex floral and fruity charm. In the low-temperature environment of cold brew, the unpleasant acidity is not over-released; instead, it brings out passion fruit, blueberry, dried fruit and ripe fermented wine notes in a very charming way, entering with low acidity and roundness, the sweetness so full it is like drinking juice.

If you want to make it yourself, for a single serving prepare 25g of Qianjie Strawberry Candy Gesha Blend coffee beans and grind to the coarseness of white sugar. Pour the coffee grounds into a clean glass container, add 300g of cold water at a 1:12 ratio, stir evenly and seal, then place in the refrigerator to steep and extract for 8 hours. Once the time is up, carefully filter out the coffee grounds with a fine mesh strainer, and you will have a cup of cold brew liquid with clean flavor and abundant aroma.

If the filtered cold brew liquid is returned to the refrigerator and left to settle for another 4 hours, until the suspended particles fully settle, the mouthfeel will appear even purer and clearer. On a hot, irritable afternoon, just pour a cup from the fridge and gulp it down for abundant nutty sweetness and fruity aroma; if you find the flavor too full, simply add a few ice cubes to dilute and sip slowly, and every mouthful is especially soft and smooth, letting you easily enjoy a relaxed, guilt-free iced coffee moment.