I put this on some ribs the other day and it was good, so I put it on some sweet potatoes. It's good on just about anything - pork, chicken, ribs, brisket. It's not the best dry rub you're going to find, but you probably have this stuff in your pantry already. If you like it sweeter, add more brown sugar. If you like spicy, add more cayenne pepper.
Easy Dry Rub
paprika, 1 tablespoon
dark brown sugar, 1-1/2 teaspoons
orange zest, 1-1/2 teaspoons
salt, 1-1/2 teaspoons
ground cumin, 3/4 teaspoon
ground black pepper, 1/2 teaspoon
cayenne pepper, 1/4 teaspoon