In a food processor, bullet or blender add lemon juice, yogurt, red wine vinegar, onion, garlic, oregano, thyme, cumin, salt, pepper and olive oil. Process until smooth.
Pour over chicken and marinate 30 mins at room temp up to overnight in fridge.
Prepare pita/tzatziki according to recipes.
Heat grill and brush grates with olive oil.
Grill 9-10 minutes per side or until internal temperature is 165 degrees/no longer pink.
Slice thin once slightly cooled.
Top pita with chicken, tzatziki and other toppings.
Recipe by Cuisine & Cocktails at https://www.cuisineandcocktails.com/grilled-chicken-gyros-with-tzatziki-sauce/