Turn on the broiler, and position the oven rack close to the heat.
Mash garlic clove with salt until it forms a paste. Add chopped oregano, lemon juice, olive oil and lots of black pepper. Rub paste all over 1 1/2 pounds peeled shrimp.
Spread shrimp out on a pan and broil, 2 to 3 minutes per side. Served topped with chopped tomatoes and crumbled feta.