Peel the beans, boil them in salt-free water for 8-10 minutes, rinse with cold water and then peel them.
Bring plenty of salted water with a peeled lemon, 2 bay leaves and a dried and carved chilli pepper to the boil. Cook the pasta in it al dente, drain and save some pasta water.
Heat some olive oil in the pasta pot and briefly sauté the chopped sage and beans. Add the brunch and a dash of pasta water and season the sauce with salt and pepper. Mix in the pasta and refine with olive oil and a few squirts of lemon juice if you like.