Peel the potato and cut into cubes; clean the broccoli and divide all the florets. Chop the shallot and fry lightly in a pan with a little oil, then add the potato and broccoli and cover with water.
Let go for 30 minutes over medium heat and season with salt and pepper. At the end of cooking, blend with a blender until you get a cream. Serve with 3 anchovy fillets per head and a tablespoon of stracciatella.