Step 1Combine beef, egg, milk, paprika, salt and rice. Roll into 2-inch balls. Melt butter in skillet over low heat. Raise heat to medium, add meatballs and brown on all sides, about 8 to 10 minutes.
Step 2Combine tomatoes, water, teriyaki sauce and onion in large saucepan. Bring to boil over medium-high heat. Drop meatballs into tomato mixture. Cover pan and simmer until sauce is thick, 40 minutes to 1 hour.