Prepare the ingredients as instructed above.

Preheat the oven to 375°F (190°C).

In a bowl, combine ground beef, ground lamb, breadcrumbs, red onion, garlic, egg, oregano, cumin, salt, and black pepper.

Shape the mixture into meatballs about 1 inch in diameter.

Heat olive oil in a skillet over medium heat. Brown the meatballs on all sides.

Transfer meatballs to a baking sheet and bake for 10–12 minutes, or until cooked through.

To make the tzatziki sauce, grate the cucumber and squeeze out excess liquid.

In a bowl, combine Greek yogurt, cucumber, garlic, dill, olive oil, salt, and black pepper. Stir and refrigerate until ready to serve.

Arrange tomato slices and avocado on a plate. Drizzle with olive oil, sprinkle with garlic, oregano, salt, and pepper.

Warm pita bread in the oven or on a skillet until soft and slightly golden.

In a blender, combine mango, yogurt, milk, cardamom, and sugar. Blend until smooth. Adjust sweetness and consistency with more sugar, milk, or mango as desired.

Place meatballs on plates and spoon tzatziki over them. Serve with tomato, avocado, feta, olives, warm pita bread, and mango lassi.