Place all ingredients, including rice in bowl and mix to combine. Form into 1 inch balls.
Prepare sauce: Mix all ingredients together. If sauce is too thick, add some water to thin it out (the meatballs will absorb the liquid as the rice cooks).
Put meatballs into a dutch oven (or roasting pan with a lid), then pour tomato sauce over top. Bake, covered at 375°F for 45 minutes-1 hour, or until meat and rice are cooked.
Notes
To speed prep time, use Minute Rice (no need to soak rice). Also add in some vegetable purée's into sauce for added nutritional value (ie. carrot, cauliflower).