Chickpea Burgers

Name: Chickpea Burgers
Ingredients: 1/3 cup olive oil, separated; 1 small onion, finely chopped; 1 tablespoon fresh thyme; Salt and pepper, to taste; 1 15-ounce can chickpeas, rinsed and drained; 1 cup cooked brown rice; 8 cloves garlic, roasted and peeled; 1/4 cup sesame tahini; 2 teaspoons lemon zest; 1/4 cup finely chopped parsley; 1 egg; 6 teaspoons Cava Foods tzatziki; 3 Roma tomatoes, cored and sliced 1/2-inch thick; 6 ounces imported feta; 5 ounces baby arugula; 6 pitas, toasted with olive oil or 6 burger rolls toasted