No boil manicotti lets you fill uncooked shells without handling slippery pasta, then bake them until tender in thinned tomato sauce.
Essential Concepts
For 8 ounces of pasta: 3 cups marinara, 1½ cups water, one layer, tightly covered.
Related posts: Homemade tomato sauce (https://www.simplyrecipes.com/recipes/basic_tomato_sauce/); classic lasagna (https://www.simplyrecipes.com/recipes/lasagna/).
