Water does not contain any fiber at all, but does not cause constipation. Neither does water with sugar. Pure fat does not contain any fiber either, whilst it keeps the bowels open. In fact: Too much of anything that does not cause constipation (like sugar and fat), moves the bowels.
Definition of rigatoni for English Language Learners. : a type of pasta that is shaped like short, wide tubes.
How to make this recipe. In a large pot of salted boiling water, cook the rigatoni until al dente, about 8 minutes. Drain, reserving 1/2 cup of the pasta water. Meanwhile, in a large, deep skillet, melt 2 tablespoons of the butter in the olive oil. Add the scallions, leeks and shallot and season with salt and pepper.