Herring with Prosciutto, Grapefruit, and Sweet Potato Mash

Right into it:

1 large white sweet potato
2 slices prosciutto, chopped
1 package lightly smoked herring
5 sections of grapefruit
1 tbsp unsalted butter, melted
1/4 cup heavy cream
salt and pepper to taste

Bring a pot of water (and a pinch of salt) to a boil. Peel and cut up the sweet potato and add to the boiling water. Cook until tender and pass through a potato ricer. Stir in heavy cream and melted butter until smooth. Season with salt and pepper. Dress with prosciutto, grapefruit sections and herring. Serves four.
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