Grate the onion using a standard size grater until you have about ½ cup of grated onion and juices.
Combine grated onion and juices with bread cubes and milk. Set aside for a few minutes to allow the bread to absorb the liquid, then mash with a fork.
Add the remaining Meatball ingredients, except the meat, and mix well.
Add the meat and gently mix until just combined. Don’t overmix or the meatballs will be tough and dry. It’s ok to still see full pieces of ground meat.
Form into 1 ½ inch sized meatballs by rolling in between your palms. It helps to dip your hands in water or to lightly coat them with oil to prevent the meat from sticking to your hands.
Heat 2 tablespoons olive oil over medium-high heat in a large pan, either a large skillet or a dutch oven.
Add the meatballs and brown all over - about 3 - 4 minutes.
When they are browned but not yet cooked through, carefully transfer them onto a plate.