Pouring cold brew coffee from one glass container to another

The Perfect Cold Brew

Connect with us!

Cold brew has a reputation for being fussy. It isn't. The process is mostly just waiting — but a few small decisions early on make a big difference in the cup.

I use organic whole bean coffee and grind fresh every single batch. And one thing I won't compromise on is grinding corse. Too fine a grind and you're pulling bitter, acidic compounds into the concentrate. Cold brew is supposed to be smooth. A coarse grind slows down extraction and keeps it that way.

If your cold brew is coming out sharp or harsh, check the grind before you change anything else.

The Milk Bag

Forget about the French press, the paper filters, and the fancy cold brew towers. I use an unbleached, non-woven cotton milk bag — the same kind people use for oat milk or almond milk. Mine has a 90 × 88 weave, which is fine enough to catch the sediment that would otherwise make your concentrate murky.

The bag doubles as your strainer and your steeping vessel. Fill it, tie it off, drop it in the water like a giant tea bag. When the steep is done, pull it out and you already have your concentrate — no pouring through filters, no mess.

The key is to not squeeze. When you pull the bag, let it drip on its own. Hang it over the jar and give it about 10 minutes under gravity. Squeezing pushes bitter, over-extracted liquid through the weave and defeats the whole point. Patience here pays off in the cup.

A milk bag with nut pulp in it dripping milk into a glass container

Breaking Down the Process

Ingredients

4 cups organic whole bean coffee

~360g, medium roast

4 cups cold water

filtered or sparkling

Water quality matters more than people think. I use water filtered for heavy metals — it keeps the flavor clean and neutral. I also like using carbonated water, which adds a subtle lift to the extraction. Either way, skip the tap water if you can.

Steeping

Once the bag is in the water, put the jar in the fridge and leave it alone.

Twenty-four hours is my standard. It produces a smooth, well-rounded concentrate with good body. If you want something richer and more intense, go to 48 — the flavor deepens without getting harsh. Don't push past that. There's a point of diminishing returns and then a cliff, and the cliff tastes bitter.

A glass jar of cold brew coffee with another glass container of

After the Steep

Pull the bag, hang it, let gravity work for 10 minutes, then discard the grounds. Coffee grounds are excellent for composting — high nitrogen, great for the garden.

What's left in the jar is your concentrate. Seal it and refrigerate. It'll keep for 3–6 weeks.

Serving

When you're ready to drink: one part concentrate, one part water. Pour over ice. Done. This diluted version stays fresh in the fridge for 3–4 days, so you can mix a few servings at the start of the week and not think about it again until Friday.

A pumpkin chia loaf with a slice cut off to show cranberries inside.

Most Popular

A cookie, croissant, loaf of seeded bread, and baguette lined up by size on a white background

Stop Throwing Your Toppings In. There's a Better Way.

Apr 15, 2026

Ask The Baker

Sensible Edibles is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate, we earn from qualifying purchases. This means that if you click on an Amazon link on our site and make a purchase, we may receive a small commission at no additional cost to you. We only recommend products and services that we believe will add value to our readers.