Once you start sprinkling this salt on food just before serving, you will become addicted to flavored salts and figure out endless variations by yourself. Any of the citrus family will work, although I have my doubts about grapefruit salt unless you use it on fruits, especially tropical ones or watermelon.
Flavored salts will last for a month in a covered jar without losing too much potency. Proportions are not written in stone, but think two-thirds pepper to one-third citrus peel. By all means add a little bit of cumin, cardamom, or fenugreek.
Mix the rind, peppercorns, and salt together. Grind in a spice mill or food processor with a very sharp blade until uniformly smooth.
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