Tzatziki is traditionally made with Greek Yogurt, so I like to use a full-fat Greek yogurt to make this recipe extra creamy. It's thicker than regular yogurt too, making this sauce a wonderful spread. There are some amazing plant based options: vegan sour cream, soy yogurt, or an almond milk yogurt. Coconut yogurt is my favorite vegan yogurt. Just make sure you use a plain yogurt and not a sweetened one.