Lasagna Al Forno with milk

3 tablespoons extra virgin olive oil 3 tablespoons butter 1 cup onion , finely diced 1/3 cup carrot , finely diced 1/4 cup celery , finely diced 1 garlic[...]

4 slices bacon , cut into small pieces 1 large onion , chopped 2 garlic cloves , minced 1 carrot , finely chopped 1 stalk celery , chopped 2 teaspoons[...]