If your lasagna comes out watery, you may need to let it rest longer before serving (at least 10 minutes). If it's still runny, carefully drain any excess liquid from your lasagna pan. Then re-bake the lasagna for 10 minutes in the oven. Don't cover the lasagna with aluminum foil. This will trap moisture and keep your lasagna from thickening up! If you can, remove the top layer of cheese before adding it back to the oven. This will prevent the cheese from burning and allow more moisture to evaporate. Cook the lasagna for 7 minutes and add your cheese layer back on. Sprinkle some extra cheese on top and cook until the new cheese melts and browns. Let the lasagna rest for at least 10 minutes and serve.