1. Preheat oven to 400°F.
2. To prepare sauce, mix together apricot preserves, vinegar, water, salt, and pepper.
3. Place meatballs in a baking dish and bake uncovered at 400°F for 15 minutes. Turn over meatballs and cook for another 10 minutes. Remove baking dish from oven and pour sauce over it, making sure each meatball is generously coated. Return to oven for another 10 minutes.
4. Serve meatballs warm, over the quinoa.