Combine yogurt, cucumber, garlic, and olive oil in the smallest bowl of your food processor. Process until completely smooth. Stir in mint leaves and lemon zest.
Cauliflower Hummus Burgers
Preheat oven to 350°F. Line a baking sheet with parchment paper or spray with olive oil mister or cooking spray.
Use a potato masher or fork to smash together cauliflower and chickpeas in a medium bowl. Don't mash them until they're mush—you want the burger to have a little bit of texture. Stir in the tahini, garlic, lemon juice, and olive oil, then add salt and pepper to taste. Fold in the beaten egg.
This mixture is a little bit wet, so you won't be able to form patties with your hands. Instead, divide it into 6 mounds on the baking sheet, then use your hands to pat the rounds into burgers.
Bake for 15 minutes, then use a spatula to carefully flip burgers (if they fall apart, press them back together) and bake for 5 minutes more, until lightly browned. Serve on rolls or in pitas and top with spinach leaves, tomato and onion slices, and mint tzatziki.
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