Greek Meatball Bowls

For the Greek meatballs:

• ~1 lb lean ground beef
• 1 small red onion grated or minced very finely
• 6 cloves garlic grated or minced
• 1/2 cup panko
• 1 tsp dried oregano
• 1/4 tsp ground cumin
• 6-7 mint leaves cut finely
• 1 egg
• 2 tbsp lemon zest
• 2 tsp salt

For the serving:

• 4 cups cooked quinoa
• lemon
• 1 cup Tzatziki sauce
• 2 cups grape tomatoes halved
• 1/2 cucumbers sliced