Place ingredients in a mason jar or glass bottle. Cover tightly and gently shake a few times. Store in a cool, dark place and shake the jar daily. Taste each day until infusion reaches desired intensity, 1 to 4 days for vodka, 2 to 4 days for tequila, and 7 to 10 days for rum. (If the infusion is too intense, you can dilute it to taste with the plain spirit.) Strain through a fine-mesh strainer or paper coffee filter into another clean, airtight glass jar or bottle, and store in the refrigerator.
The Simplest Simple Syrup
Cocktail recipes often call for simple syrup, which is traditionally made by boiling 1 cup of sugar in 1 cup of water. But here's an easier way—just shake equal parts sugar and water in a tightly sealed glass jar until the sugar dissolves. Presto: instant simple syrup.
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