Peel, wash and chop the potatoes. Clean the cauliflower and cut into small florets. Cook the cauliflower florets and potatoes in salted water for about 20 minutes until soft
Roast sesame seeds in a pan without fat, remove. Drain potatoes and cauliflower. Add cream and mash. Season to taste with salt and nutmeg
Remove the mackerel fillets from the skin and pluck into pieces. Arrange the cauliflower puree and mackerel in bowls and sprinkle with sesame