ingredients 1 tablespoon olive oil 1 tablespoon unsalted butter 2/3 cup orzo (rice-shaped pasta) I used soup pasta 1 medium onion, finely chopped (1 cup) 2 carrots, cut into 1/4-inch dice (3/4 cup) 2 celery ribs, cut into 1/4-inch dice (2/3 cup) 2 garlic cloves, finely chopped 1/4 teaspoon salt 1/4 teaspoon black pepper 1/2…