In 3-quart saucepan over medium-high heat, melt butter. Add onions and cook, stirring, until starting to soften.

In large bowl, combine onions, beef, 1 cup uncooked rice, egg, seasoning and 1/4 cup water; mix gently by hand until well blended. Shape mixture into medium-sized meatballs.

Pour pasta sauce and remaining water into same 3-quart saucepan. Stir and bring to boil. Add meatballs and return to boil.

Reduce heat to low and cover. Simmer 15 minutes, or until meatballs are cooked through.

Serve meatballs and sauce over extra cooked rice and top with grated Parmesan cheese.