In a mixing bowl, combine olive oil, minced garlic, lemon juice, dried oregano, thyme, salt, and pepper. Whisk until well mixed. Add the sirloin steak and coat it thoroughly in the marinade. Let it marinate for at least 30 minutes.

While the steak marinates, prepare the homemade tzatziki. In a separate bowl, combine Greek yogurt, minced garlic, diced cucumber, lemon juice, salt, and chopped fresh herbs. Mix well and refrigerate for 15-20 minutes.

In a small bowl, whisk together lemon juice, olive oil, salt, and pepper to create a light lemon vinaigrette.

Heat a skillet or grill pan over medium-high heat. Once hot, add the marinated steak, cooking for 4-5 minutes on each side. Let the steak rest for at least 5 minutes before slicing it thinly.

To create your Mediterranean Steak Bowl, layer your choice of cooked grains into a bowl. Top it with sliced steak, cherry tomatoes, cucumber, red onion, and olives. Drizzle with tzatziki and lemon vinaigrette.

Sprinkle crumbled feta cheese and fresh herbs over the top for added flavor and presentation.