Herby Mediterranean Meatballs

Name: Herby Mediterranean Meatballs
Ingredients: 1 cup fresh parsley leaves; 1/2 cup fresh oregano leaves; 1/4 cup fresh dill; 5 cloves garlic; 1 lemon, zested and juiced; 1/2 teaspoon red pepper flakes; 1/4 teaspoon kosher salt; 1/4 teaspoon black pepper; 1/3 cup olive oil; 1 1/2 pounds Italian sausage, removed from its casings; 1/2 cup Greek yogurt; 1/4 cup chopped Castelvetrano olives; 7 to 8 multi-colored grape tomatoes, quartered; 1/3 cup crumbled feta; Warmed pita triangles, for serving