Tip of the day:
When making homemade meatballs and adding onions, never put it raw onions into your meatball mixture. This will cause your onions to cook out causing your meatballs to break apart!
So saute your onions in some olive oil, cooling prior to adding to your meatball mixture.
Try mixing up your flavors buy substituting onions for scallions or leeks into your meatballs for a great new burst of flavor!