Blanch the spinach for five minutes in boiling water then drain well. Remove any crusts from the bread and discard them. Dip the bread in the milk to soften it. Peel and crush (mince) the garlic and chop the parsley.
Mix together the bread, parsley, garlic and nutmeg, then season with salt and freshly ground pepper to taste. Mix in the lean minced beef then beat the eggs and finely slice the spinach before adding them to the mix.
Form the meatballs and cook them in a hot, non-stick frying pan without the aid of any fat. To do this, simply roll the meatballs around the hot pan until they are cooked and golden. Serve on a bed of salad leaves.