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I use a ratio of 4 oz liquid to .20 oz coarse ground coffee. Most people make their cold brew much “stronger” (a higher ratio of coffee grounds to liquid) and use it like a concentrate. I feel like that wastes a lot of coffee that never gets extracted. I’d start with your normal ratio, see how it comes out. If you think it could be better, adjust accordingly.
The general rule is: the longer a coffee spends extracting in liquid, the coarser the grind should be. So how coarse depends on how long you intend to brew it, and what you’re brewing it in (we’re talking about water in this article but you can also cold brew in milk – look for a future article about that).
If you’re steeping it for 24 hours, grind it at the coarsest setting. I usually do a 10-12 hour brew and I grind it coarser than for a pour-over, but not the coarsest setting.
I want the grounds to be too big to stick to my finger, but not so small they’ll be hard to strain out of the coffee.
Pour water into your coffee, stir it up, cover it and stick it in the fridge. It’ll be ready to strain and serve tomorrow.
Jar method. The simplest way to make delicious cold brew is to pour your ground coffee into a jar and pour your water in. Stir it for a second to be sure it isn’t clumping, put a lid on it and stick in the fridge. It’ll be ready in about 10 hours.
French Press. I usually use a French Press to make my cold brew. It’s as easy as a hot press, but after I’ve stirred the coffee and pushed the plunger down just enough to get the coffee under the water, I stick the whole thing in the fridge for the extraction period.
Cold Brew Kit. If you have a cold brew kit, your grounds go into the sock and you tie it up tight, so grounds don’t leak out, and put it into the jar. Pour the water in and stick it in the fridge for the extraction period.
After sitting in water for so long, your grounds are saturated and delicate, so you want to be careful not to agitate them too much (so they don’t break up into smaller grounds and get through your strainer, bringing bitter pieces of the plant fiber with it). Don’t stir it, now you just want to pour the brew out of the grounds.
Jar method. Pour the mixture out of the jar through a strainer lined with folded cheesecloth, into another jar or vessel. You may have to strain several times to get most of the grounds out.
French Press. Do not fully press the plunge or you may agitate the grounds. Push it gently down until you feel it break free of the grounds and sink into the liquid trapped below, then carefully pour the coffee out of the press and through a strainer lined with cheesecloth to get the grounds out.
Cold Brew Kit. Remove the brewing sock with the saturated grounds from the jar. Try not to squeeze the saturated sock, it’ll have the bitter parts of the coffee in it. Put your jar of cold brew in the fridge. It’s ready when you want it.
Your cold brew will keep in the fridge for up to 2 weeks. Pour yourself a cup and sip it before you put in cream and sugar. You’ll be surprised how sweet it comes out!
If you're looking for YB founder Ryan's hybrid ice coffee recipe, find that in this article.