Two weeks ago my husband Ted spent a few days battling a nasty Spring cold. I plied him with soup, soup and more soup, but there came a moment when neither of us could stand the sight of another bowl of it. With comfort food on my mind, I ransacked the pantry and found all of the ingredients for this recipe, a very traditional meatless marinara sauce. I tossed everything into the slow cooker for six hours; then I added the magic ingredient, the rind from a small wedge of Parmigiano-Reggiano cheese, and continued to cook the sauce for an additional two hours. (For a vegan sauce, simply omit the cheese rind.) You can make this marinara recipe exactly the same way in a Dutch oven on the stovetop, except that you'll have to stir occasionally to keep the sauce from sticking. Pour the sauce over a bowl of spaghetti or gluten-free pasta, top with more parmesan cheese, and let the comforting begin.