How to Make It
Preheat the oven to 350°. In a small skillet, melt 6 tablespoons of the butter with the sage, poppy seeds and caraway seeds and cook over moderate heat, stirring, until nutty and fragrant, about 5 minutes. Transfer to a bowl.
Meanwhile, bring a large pot of salted water to a boil. Add the potato and cook until tender, about 5 minutes. Using a slotted spoon, transfer the potato to a bowl. Add the pasta to the pot and cook, stirring, until al dente, about 2 minutes. Using a slotted spoon, transfer the pasta to a colander. Add the cabbage to the pot and cook until just wilted, about 3 minutes. Drain the cabbage and shake out the excess water. Pour off the water and return the cabbage to the pot, along with the pasta and potato. Add the browned butter, season with salt and pepper and toss well. Stir in 1 cup of the Fontina and half of the Parmigiano and transfer the mixture to a 9-by-13-inch baking dish.
In the small skillet, melt the remaining 2 tablespoons of butter. Add the bread crumbs and parsley and cook over moderate heat, stirring, until golden and toasted, 3 minutes. Stir in the remaining Fontina and Parmigiano and sprinkle over the pasta. Bake for 35 minutes, or until golden brown on top. Serve hot.