Lasagna with balsamic

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[...]

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[...]

1/4 cup olive oil 2 cloves garlic 1/2 bell pepper , chopped 1 medium onion , finely chopped 1/2 cup celery , finely chopped 1 1/2 lbs lean ground beef 2 1/2[...]