Greek Lamb Meatballs with Tzatziki

Name: Greek Lamb Meatballs with Tzatziki
Ingredients: 1 pound ground lamb; 1/4 cup red onion (finely chopped); 3 cloves garlic (minced); 1 tablespoon flat-leaf parsley (minced); 2 teaspoons fresh mint (minced); 1 egg; 2 tablespoons panko breadcrumbs; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 1 cup Greek Yogurt; 1 Persian cucumbers (small dice); 1 lemon (juiced, plus more if needed); 3 cloves garlic (finely minced); 2 tablespoons fresh dill (chopped); Kosher salt and freshly cracked black pepper to taste; 1/2 cup feta; chopped parsley (to garnish)