Easy Ground Beef Gyros

1. Make Tzatziki by combining 1 cup plain Greek yogurt, 1 tbsp fresh dill, 1/4 cup grated cucumber, 1 tbsp lemon juice, 1 finely minced garlic clove, 1/2 tsp salt, and 1/2 tsp black pepper. Combine well and place in the refrigerator until ready to serve.
2. Heat 1 tbsp olive oil over medium-high heat and add 1 lb ground beef, breaking it up with a wooden spoon.
3. Add 1 tsp ground cumin, 1 tsp ground oregano, 1 tsp ground thyme, 1 tsp garlic powder, 1 finely minced garlic clove, 1 tsp salt, and 1/2 tsp black pepper to the ground beef and mix well. Cook until the meat is browned.
4. To assemble, add a layer of tzatziki to the pita, then top with lettuce, seasoned gyro meat, tomatoes, red onion, and feta cheese. Wrap in aluminum foil and serve immediately with extra tzatziki if desired.