I make turkey meatballs using 1 egg, 1 cup of pre-boiled cabbage (goes a fair way to making up for not having bread in them), some red onion, mushroom, green pepper and lots of spices. Seems to work just fine no matter which kind of meat (although I add rosemary and mint for lamb instead of the garlic pepper and cayenne for the others).
Glad yours went down well and you had a good night on the giddyups, Gem.