Use a mortar and pestle and crush garlic. Add olive oil, lemon, salt and pepper. Grind to a paste and stir in parsley.
Rub the past over the prepared shrimp. Then skewer the shrimp with pre-soaked wooden skewers.
Place shrimp skewers on grill over direct heat, grilling each side for 2-3 minutes. Remove from grill and place on serving platter. Sprinkle crumbled Feta and diced tomatoes over shrimp and garnish with additional parsley if desired. Serve immediately.
If using the oven broiler method, place oven rack at highest level. Place shrimp on a cookie sheet, broil each side for 2-3 minutes. Remove from oven and garnish with Feta and tomatoes.