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["Position rack in center of oven and preheat to 450 degrees.", "Bring well-salted water to boil in a large pot with a pasta insert.", "Grease a 9x13"" baking dish with 1 tablespoons olive oil.", "Pour off 1 cup of juice from 1 of the cans of tomatoes and discard it.", "In a blender or a food porcessor, puree both cans of tomatoes with their remaining juice and set aside.", "Heat remainin 2 tablespoons olive oil in a 6-8 quart Dutch oven over medium-high heat.", "When oil is shimmering, about 1 minute, add onions and 1/4 teaspoons of salt and cook, stirring occasionally, unti nicely browned, 5-10 minutes.", "Push the onion to the side of the Dutch oven and add the garlic.", "Cook until it just starts to sizzle and becomes fragrant, about 10 seconds.", "Add pureed tomates and cream, plus remaining 1 teaspoons salt.", "Bring to boil over medium-hihgh heat, reduce to a gentle simmer, and cook for 10 minutes, stirring occasionally, so that sauce thickens a bit.", "Add parsley and red pepper flakes and cook until flavors are melded, about 5 minutes more.", "Taste for salt and pepper and remove from heat.", "Meanwhile, when salted water comes to boil, cook rigatoni until al dente, about 10 minutes.", "Drain pasta, reserving pasta water in pot.", "Add pasta to sauce.", "Return water to a boil and add cauliflower to pot.", "Cook cauliflower until barely tender, about 2 minutes.", "Drain and add to sauce.", "Add 1 1/2 cups of Fontina cheese to pasta mixture and toss well.", "Transfer to prepared baking dish and spread evenly.", "Top pasta with remaining 1 cup of Fontina cheese and then the Parmigiano-Reggiano.", "Bake, uncovered, until cheese is golden brown, about 15 minutes.", "Let pasta rest for 10 minutes before serving."]
