Method
Grind 60g medium roast and 40g dark roast beans to medium-coarse consistency
Mix the grounds in a large jar or cold brew maker
Add 400ml room temperature filtered water to the coffee grounds
Stir gently to ensure all grounds are saturated
Cover and steep at room temperature for 6 hours
Without straining, add remaining 200ml water
Stir once and continue steeping for another 6 hours
Strain through fine mesh strainer, then filter through coffee filter
Store concentrate in refrigerator for up to 2 weeks
Mix 1:1 with cold water or milk over ice
Adjust ratio to taste preference



