In a bowl, mix together the marinade ingredients: olive oil, minced garlic, lemon juice, oregano, thyme, salt, and pepper. Coat the sirloin steak well and let it marinate for 30 minutes to 4 hours for the best flavor.

To prepare the tzatziki sauce, combine Greek yogurt, grated cucumber, lemon juice, minced garlic, fresh dill, and a pinch of salt and pepper. Chill it in the fridge until ready to serve.

For the vinaigrette, whisk together olive oil, lemon juice, honey (if using), minced garlic, and oregano. Set aside.

Heat a skillet over high heat. Sear the marinated steak for about 4–5 minutes on each side, or until it reaches your desired doneness. Allow it to rest for a few minutes, then slice it thinly against the grain.

In bowls, layer the cooked grains, sliced steak, and your chosen toppings, including cherry tomatoes, diced cucumber, red onion, olives, herbs, and feta cheese. Drizzle with tzatziki sauce and vinaigrette just before serving.