Cold brew is delicious, but sometimes you don't want to wait the full 16 to 18 hours for it to steep. That's where your sous vide cooker comes in! Sous vide cold brew preserves the low acidity and smooth texture of cold brew but drastically reduces the amount of time required.
Grind your coffee on a very coarse setting. At least as coarse as you would use for French press or even slightly coarser.
Add water and coffee to your mason jar.
Seal the jar. Be careful not to overtighten the lid.
Put your jar in a 150º F sous vide bath. Set a timer for 2 hours.
When it's finished brewing, filter the coffee. The easiest way is to pour each jar through a Chemex filter. One Chemex filter can get you through several mason jars before it clogs and you need a new one. Any coffee filtering method will work, though.
We like to use a 7:1 water-to-coffee ratio for all of our cold brews. You can make as much or as little coffee as you like but make sure you can fit enough coffee and water in your sealable jar before you start. If you’re using a standard mason jar, 12 ounces/350 g of water and 1.75 ounces/50g of coffee is a good amount.