Lamb Meatball Pitas

Name: Lamb Meatball Pitas
Ingredients: 1 slice sandwich bread , ripped into small pieces; 1/3 cup whole milk; 1 large egg; 1 pound ground lamb; 2 cloves garlic , minced; 1/2 cup fresh cilantro, chopped; 3 tablespoons fresh mint , chopped; 1 1/2 teaspoons ground coriander; 1 teaspoon kosher salt; 1 teaspoon ground cumin; 1 teaspoon finely grated orange zest; 1/2 teaspoon ground cinnamon; 1/16 teaspoon ground cayenne , or to taste; 1 tablespoon extra-virgin olive oil or canola oil; 2 tablespoons pomegranate molasses; 1/2 cup Greek yogurt; 1 clove garlic , minced; 1 tablespoon finely grated lemon zest; Salt, to taste; Pepper, to taste; 4 pita pockets; 4 cups lightly packed arugula or baby watercress; 8 mint leaves , torn into smaller pieces; 1/2 cup pomegranate seeds; Garlic yogurt sauce (optional)