Begin by zesting a lime and a lemon rind using a microplane grater.
Combine with coarse salt. Gently mix the salt and zests together.
Use to rim a margarita glass or store in an airtight container in a cool, dry place for future use.
Notes
Customize Flavor - You can customize the flavor of your margarita salt endlessly by using different spices, finely chopped herbs or zests.
Store in Fridge - For the longest shelf life, store in the fridge. I have been keeping mine in the fridge for over a month and it's still going strong.
Sweet Rim - For added sweetness, you can cut in half sugar with half salt. You can also use this same method with any coarse sugar to make flavored sugar for rimming your glasses.
Dye the Color - For a festive colored cocktail rim, add a drop of food coloring to your salt rim ingredient. Shake in a sealed jar to evenly distribute to dye to all the salt before using. You likely only need one drop of food coloring—a little goes a long way.