Marinate the Steak: Whisk together olive oil, minced garlic, lemon juice, oregano, thyme, salt, and pepper in a bowl. Coat the sirloin steak in marinade and refrigerate for at least 30 minutes.

Prepare Tzatziki: Combine Greek yogurt, grated cucumber, minced garlic, lemon juice, and a pinch of salt in a mixing bowl. Stir until smooth and refrigerate for at least 15 minutes.

Make Vinaigrette: In a small bowl, whisk together olive oil, lemon juice, honey (if using), salt, and pepper. Set aside while cooking the steak.

Cook the Steak: Heat a cast-iron skillet over medium-high. Cook the steak for 4-5 minutes on each side until done. Let it rest for 5-10 minutes.

Assemble the Bowls: Layer cooked grains in bowls, slice rested steak against the grain, and add fresh vegetables, olives, and feta (if using).

Drizzle with Tzatziki and Vinaigrette: Add tzatziki sauce over the steak and vegetables, then drizzle vinaigrette over everything.