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Preheat oven to 350F
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Beat the butter, sugar, and lime zest together until nice and fluffy. Add eggs one a time, then the vanilla. Scrape the bowl to make sure it’s all incorporated.
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Sift together the flour, salt, baking soda, baking powder, and set aside. Whisk the food coloring into the milk and set aside. This is not a necessary step, but I find I get smoother-colored cakes and have to mix the batter less.
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Alternate adding the milk, flour mixture, and lime juice and stir just until combined.
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Scoop the batter into lined cupcake tins and bake at 350 for 12-15 minutes or until a toothpick inserted in the center comes out clean.
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Set aside to cool while you prepare the frosting.