Ground Sichuan pepper: Sort Sichuan peppercorns and discard any black seeds or twigs. Toast in a dry skillet or toaster oven until pods start to smell very fragrant, but do not brown them. Let peppercorns cool, then grind in a spice grinder or in a mortar & pestle to your desired coarseness. Sift out any yellow husks that don't break down. Sichuan pepper powder will retain its potent flavor and numbing punch for only a few weeks.