Trust Ina Garten to take two big food trends — cauliflower and toast — and combine them into something completely fresh. This recipe, adapted from her 2018 cookbook, “Cook Like a Pro,” is a bit like an open-face grilled cheese sandwich with a nutty layer of roasted cauliflower, and spiked with nutmeg and paprika. We made it vegetarian by leaving out the prosciutto, and also lightened up on the cheese. It makes a vegetarian dinner with soup and salad, or a good snack with drinks.