Thinly slice lamb, beef, chicken, or pork
Mix the meat with olive oil, garlic, oregano, thyme, rosemary, paprika, salt, and black pepper
Add lemon juice or yogurt for extra tenderness if desired
Marinate the meat for at least 1 hour, preferably overnight
Cook the meat in a hot skillet, grill, or oven until browned and fully cooked
Warm pita bread or flatbread
Mix tzatziki sauce with yogurt, cucumber, garlic, lemon juice, dill, salt, and olive oil
Slice tomatoes, onions, and lettuce or other desired toppings
Fill the bread with cooked meat
Add tzatziki sauce and toppings
Fold and serve immediately