place the broccoli florets in a pot, add water until they’re submerged, plus the coarse salt and bicarbonate of soda, and bring to the boil (lid on).
simmer until tender but al-dente (about 3 minutes - use a fork to check), then drain and set aside, reserving 100g of the cooking water.
remove skin from chipolatas or sausages, cut the meat into 2-3cm pieces and put them in a frying pan together with the anchovies and butter; pan-fry until the sausage pieces are caramelised and the anchovies have pretty much dissolved.
slice a couple of the cooked florets and leave them aside; put the rest in a Pyrex glass mixing bowl or similar; add fine salt, black pepper, nutmeg and the cream.
blitz with an immersion (stick) blender until you obtain a smooth cream; taste test and adjust seasoning to your preference.
pour the broccoli cream into the sausage frying pan, then add the reserved cooking water as well as the pasta.
stir over medium high heat for a few minutes, adding a little more lukewarm water if necessary to loosen (qk pasta is quite absorbent).
once piping hot, plate immediately and garnish with the sliced broccoli florets.
Notes
Bicarbonate of soda (baking soda) is optional. I use it to retain the vibrant green colour of the broccoli.