Place 1/4 cup coffee grounds into each jar, then top with water. Screw on the lids until just barely tightened; do not overtighten.
Fill a large pot with enough water to cover the jars completely and place a sous vide immersion cooker into the water. Set temperature to 150 degrees F (65 degrees C) according to manufacturer’s directions.
Submerge mason jars into the water bath and set timer for 2 hours.
Remove jars to a cooling rack and let cool until easily handled. Strain the mixture through a coffee filter to stop the steeping process. Pour over ice and serve, or return to rinsed-out jars and store in the refrigerator for up to 1 week.
Feel free to use any size jars, but keep the 1:8 coffee to water ratio in mind. For a 32-ounce quart-size jar, use 4 cups of water and 1/2 cup of coffee grounds.
For a lighter brew, set timer for 1 1/2 hours. For a more concentrated brew, set timer for 2 1/2 hours.
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