Using a wooden spoon, saute the leeks in a large skillet with about 3 tablespoons olive oil over medium-high heat, for about 10 minutes, stirring often. Remove from the heat once completely softened and the leeks begin to turn a golden blonde.
While the leeks are cooking, start the meatballs:
In a large bowl, mix together the ground meat, shallot (or onion), chopped parsley, 2 tablespoons bread crumbs, grated Parmesan, and egg yolk. Season the mixture lightly with salt and freshly ground pepper.
Pour the bread crumbs in a pasta bowl and roll in the meatballs as you are preparing them. Set the meat aside on a large plate, do not make a pile; use 2 plates, if necessary.
Return the pan with the leeks to a medium-high heat, add the meatballs and saute gently flipping them once or twice.
Once they are browned, lower the heat and add the broth a few tablespoons at a time. Season with a light sprinkle of salt and some ground pepper, lower the heat to medium-low and cook for about 25 minutes, always making sure that the sauce does not dry up.
Serves: 6; Calories: 265; Total Fat: 10 grams; Saturated Fat: 2 grams; Protein: 24 grams; Total carbohydrates: 21 grams; Sugar: 3 grams; Fiber: 1.5 grams; Cholesterol: 65 milligrams; Sodium: 351 milligrams