Step 1

Combine all ingredients in the canister of a blender and blend on high speed until smooth, 30 to 60 seconds.

Step 2

Transfer mixture to a glass bottle or airtight container with a tight-fitting lid and store in the refrigerator for up to 2 months (I have read anywhere between 1 to 2 months; the alcohol helps preserve it, but always use the sniff test and common sense).

Step 3

Shake well before using.