Meatballs and meatloaves are a staple in Jewish Italian kitchens: I would go as far as to say that every family has a different version (and every son swears that his mother’s is the best!).
For many centuries most Jews in Italy were poor, and had only sporadic access to meat: one of the ways they found to make use of cheaper cuts was grinding the meat and stretching it with different ingredients – bread, eggs, and countless vegetables. The result included not only delicious meatloaves and meatballs, but also a variety of stuffed vegetables and pasta. These dishes are great for Shabbat and the holidays when food needs to be prepared in advance and reheated, because they don’t harden and actually taste better the day after.
If you choose one of the versions that incorporate cooked, chopped vegetables (spinach, leeks, zucchini, eggplant… the options are endless!) you might also be able to sneak some greens into the diets of the most irreducible picky eaters.