Chop the lettuce and slice vegetables. Make the vinaigrette by whisking the olive oil, lemon juice, lemon zest, red wine vinegar, oregano, and garlic together. Season to taste with salt and pepper. Pour into a small pitcher and set aside. Assemble the salad ingredients on a large, shallow platter. Layering the ingredients however you like. I like to pass the vinaigrette, so everyone can dress their own salad. Serve with pita or crusty bread.