For another shortcut, feel free omit the carrot, celery, and onion and replace the canned tomatoes and paste with 2 (24-ounce) jars prepared homemade or store-bought marinara. Follow directions for cooking the meat, adding milk and wine (if using), and add the prepared sauce to the Dutch oven. Bring to a simmer and cook for 5-10 minutes, then remove from heat and keep warm until ready to assemble lasagna.