2 tablespoons olive oil
1 pound ground lamb
1/2 cup minced onion
1 teaspoon minced lemon zest
1/2 teaspoon dried oregano
1/2 teaspoon garlic powder
1/2 teaspoon salt
1/2 teaspoon black pepper
1/4 cup lemon juice
1 cup water

1 (6 ounce) container plain yogurt
3 ounces crumbled feta cheese
1/4 teaspoon dried oregano
1/4 teaspoon garlic powder
1/4 teaspoon lemon zest
salt and pepper to taste

6 pita bread rounds