Moisten bread with milk. Squeeze out excess milk.
In a skillet over medium heat, cook bacon with onions for 5 to 8 minutes, or until bacon is crisp. Pour off and discard fat. Set pan aside to cool.
Bring a pot of water to a boil.
Mix together bread, onions and bacon, eggs, salami, Parmesan, 4 to 5 tablespoons parsley, salt, pepper, and nutmeg. Add enough flour to form soft balls about 3 inches in diameter. (You can make balls another size but must adjust cooking time.)
Drop balls, one at a time, into boiling water. Simmer 3-inch balls for 15 minutes, or until each puffs up and rises to the top. Remove balls carefully with a slotted spoon.
Serve one or two balls per bowl, covered with heated broth. Garnish with remaining parsley.