Turn on the broiler, and put the rack close to heat.
Mash 1 garlic clove with 1 teaspoon salt until it forms a paste.
Add to it 1/2 teaspoon cayenne, 1 teaspoon paprika, 1 tablespoon lemon juice, 2 tablespoons olive oil and lots of black pepper.
Rub paste all over 1 1/2 pounds peeled shrimp.
Broil, 2 to 3 minutes per side.