Clean and preheat grill to high. Season burgers as desired with Omaha Steaks All Natural Seasoning. Grill for 4-5 minutes per side until internal temperature reads 160°F. Sprinkle crumbled Feta Cheese on each burger before removing from the grill.
Lightly toast the Ciabatta Buns on the grill. Then spread 1 Tbsp of Tzatziki Sauce on each half of bun.
Place burgers on buns and top with green leaf and tomato slices.