Cut broccoli into florets from the stalk, wash and cook in boiling salted water for about 3 minutes. Cut the sausage into small strips. Bring 1 litre of water to the boil and let it cool down for about 2 minutes. Stir in the puree flakes briefly with a wooden spoon. Add 50 g butter, season with salt and nutmeg. Melt 1 teaspoon of butter in a small pot, dust with flour and deglaze with stock and cream. Stir in mustard, season to taste with salt and pepper
Place 1 heaped tablespoon of mashed potatoes in each of 4 ovenproof flat baking dishes and smooth them down. Pour the rest of the mashed potatoes into a piping bag with a perforated spout and spray a tufted ring around the edge of the mould. Spread the broccoli and sausage in the middle, leaving the middle free. Pour the mustard sauce over the broccoli and sausage. Carefully place 1 beaten egg in the middle. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 20 minutes. Remove the ramekins and serve immediately