To prepare a vegetable and feta latkes recipe, you will first need to prepare the vegetable mixture. You can use any vegetable you like, as long as it hasn't been peeled or wilted. Cut the vegetables into small cubes and add them to the pan. Heat the oil over medium-high heat. Add the garlic and saute until it starts to turn golden brown, about 2 minutes. Then add the onions and cook until they start to soften, 2 to 3 minutes more. Stir in the tzatziki sauce and salt and pepper to taste. Cook the mixture for 1 to 2 more minutes, stirring constantly. Remove from the heat and stir in 2 tablespoons of kosher salt, 1 tablespoon of olive oil, and 1 teaspoon of freshly ground black pepper. Serve with your favorite dipping sauce.