Moroccan Meatballs with Arugula

Name: Moroccan Meatballs with Arugula
Ingredients: 1⁄2 cup milk; 1 1⁄2 (8-inch) whole wheat pitas, torn into 1-inch pieces; 2 lb. ground lamb; 1 1⁄2 cups minced parsley; 3⁄4 cup minced mint; 1 tsp. dried oregano; 9 cloves garlic, 6 minced, 3 peeled and crushed; Kosher salt and freshly ground black pepper, to taste; 2 tbsp. olive oil; 1 (28-oz.) can whole peeled tomatoes, crushed by hand; 1 1⁄2 tbsp. harissa; 2 egg yolks; 1⁄2 cup canola oil; 3⁄4 cup Greek yogurt; 1 tbsp. fresh lemon juice; 1⁄2 cup roughly chopped basil; 8 cups baby arugula; 16 cherry tomatoes, halved