1. Line a plate with paper towels. Mix turkey, onion, garlic, ginger, egg, panko and salt in a bowl. Shape into 1 1/2-inch balls.
2. Warm vegetable oil in a skillet over medium-high heat. Cook meatballs, turning, until browned, about 8 minutes. Drain on lined plate; transfer to slow cooker. Scatter bell pepper on top.
3. Whisk together vinegar, soy sauce, sugar, crushed red pepper and 1 Tbsp. cornstarch; pour over meatballs. Cover; cook on low for 5 to 7 hours. Whisk remaining cornstarch into juice. During last 30 minutes of cooking, stir in pineapple and juice mixture.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.