Tzatziki Sauce

1. In a medium bowl combine all the ingredients and chill for at least 1 hour to allow the flavors to marry.

Gyros

1. In a bowl, whisk together the oil, lemon juice, garlic, oregano, rosemary, salt and pepper.
2. Pour over the ahi steak.
3. Cover with plastic wrap and marinate, refrigerated, for at least 2 and up to 6 hours, turning occasionally.
4. Brush a grill lightly with olive oil and preheat to medium heat.
5. Remove the ahi from the marinade and place on the grill.
6. Cook for approximately 4 minutes (2 minutes per side for a 3/4" steak).
7. For a more rare ahi, heat the grill to high, and sear quickly, about 1.5" minutes per side.
8. Thinly slice the ahi into strips and place the meat in the center of the pita breads.
9. Top with Tzatziki sauce, lettuce and chopped tomatoes, and serve.
10. For best results, brush the pita with olive oil and lightly warm on the grill.
11. Serve with tabbouleh salad, cucumber salad or a fresh green salad.