Scalloped Potatoes With Ham with mushroom

4 whole garlic heads 2 teaspoons olive oil 2 1/3 cups minced shallots (about 15 medium) 3 cups chopped mushrooms (8 ounces) 2 tablespoons balsamic vinegar 2[...]

10 3/4 cups mushrooms , sliced (about 3 pounds) 1 tablespoon olive oil 3/4 cup onion , minced 1/2 cup leek , minced (about 1 small) 2 garlic cloves , minced[...]