Cold brew concentrate vs. making your own

Bottled cold brew concentrate is one of the most heavily marked-up products in the grocery store, and the reason is that the thing it sells, twelve hours of waiting, costs the manufacturer almost nothing and costs you almost nothing either.

Cold brew is the least skilled coffee preparation that exists. There's no temperature to hit, no pour rate, no bloom, no timing window. You put coarse grounds in cold water, you leave, you come back, you strain. The process is essentially unfailable.

Do the arithmetic once

Here's the calculation, and you should run it with your own numbers rather than take mine.

A standard home cold brew maker uses about 10 ounces of coarsely ground coffee to produce 32 ounces of concentrate, roughly 14 drinks once diluted. So the per-batch cost is: 10 ounces of whatever beans you buy, divided by 14.

At a mid-range specialty bean price, that lands well under a dollar a drink. At grocery-store bean prices, dramatically less. Compare that to a bottle of ready-made concentrate, which typically yields four to eight drinks for the price of a bag of good beans.

The gap is large enough that the equipment pays for itself in a matter of weeks for a daily drinker, and that's before accounting for the fact that you're choosing the beans.

The part that matters: grind

Coarse. Coarser than you think, closer to raw sugar than to sand.

Cold water extracts slowly and gently, which is the entire appeal, but it means fine grounds over-extract in the long steep and turn the result bitter and muddy. Fine grounds also clog every filter these makers use. Manufacturers say this outright: finer grounds may prevent the brewer from draining properly. That isn't a warning about inconvenience, it's a warning about a clogged filter and a mess.

If you're buying pre-ground coffee, this is the one place where the grind label matters. Buy coarse, or buy whole bean and grind it yourself on the coarsest setting your grinder offers.

What the good makers add

You can make cold brew in a jar with a sieve. What a purpose-built maker buys you is filtration quality and the absence of mess, and those are worth more than they sound after the third time you strain grounds through a cloth.

OXO's design pours water through a perforated top that distributes it evenly over the bed of grounds rather than dumping it in one spot, which matters because unevenly wetted grounds extract unevenly. A switch controls draining, and the ultra-fine stainless mesh filter is reusable and dishwasher safe.

The pitcher approach

The alternative design skips the separate carafe: you steep and store in the same vessel, with a filter basket that lifts out. Fewer parts, less to wash, and it lives in a fridge door.

Takeya's version is BPA-free Tritan rather than glass, so it doesn't shatter, and the lid is airtight and leakproof, which matters more than you'd think, because coffee picks up fridge smells fast and an open pitcher of concentrate will taste like whatever is next to it within two days.

Why cold brew tastes the way it does

Hot water extracts a broad range of compounds quickly, including acids and some bitter compounds that give hot coffee its brightness and edge. Cold water extracts far more slowly and pulls a narrower set, weighted toward sweeter, heavier, less acidic compounds.

That's why cold brew reads smooth and low-acid, and it's also why it can taste flat and one-dimensional compared to a good hot pour-over. If you love the acidity in a bright Ethiopian bean, cold brewing it will strip out most of what you love. Cold brew rewards chocolatey, nutty, heavier-bodied beans . The ones a pour-over crowd sometimes finds boring.

Two practical notes

Steep in the fridge, not the counter, if you're going beyond about twelve hours. Room temperature over a long steep is a hospitable environment for things you don't want growing in your coffee.

Concentrate keeps well but not forever. Sealed and refrigerated, it holds up for roughly a week to ten days before it starts tasting dull. That's far longer than brewed hot coffee, which is one of the format's advantages, but it isn't indefinite.

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