Blend Spent Citrus Rinds Into a Cocktail Syrup

Citrus season may be over, but lemons and limes persist. Both fruits are widely used to add a little (or a lot) of acid to dishes and drinks, and both, once juiced, leave behind a shell of pith and zest. You can compost the spent rinds, or freeze and zest them later...or you can blend them with water and use the …