In large mixing bowl combine ground beef, minced onion, seasoned breadcrumbs, eggs, and season salt
Heat oil in large deep skillet over medium-high heat
Hand roll beef mixture into small 1 1/2-inch meatballs
Cook meatballs in batches in skillet, turning gently with a large spoon until all sides are brown, approximately 15-20 minutes total before transferring cooked paper towel lined plate to cool
Boil pasta in salted water until tender
Before draining cooked pasta, use a glass measuring cup to scoop out about 1/4 cup of cooking water to reserve
Drain pasta and transfer to a serving bowl
Add cooking water to pasta in bowl and toss