Place potatoes in a large pot, add salted water, cover and bring to a boil. Cook until very soft, 20 to 30 minutes.
When potatoes are soft, drain and return them to the pot to mash by hand or place them in a bowl of an electric mixer. Add salt to taste and the butter.
Beat ingredients. Adjust seasonings and add the cream and pecorino cheese and beat again.
Sauce Directions:
Trim the fennel bulbs and cut into matchstick pieces. Pour the olive oil into a skillet and set it over medium-high heat. Add garlic and cook until fragrant, about 2 minutes. Add the onion slices and sauté until they begin to wilt. Add the fennel and crushed red peppers flakes and cook until fennel begins to wilt.
Clear a spot in the center of the pan, add the tomato paste and cook, stirring it in the spot for a good minute or more, until it begins to caramelize; then mix it in with everything else.
Ladle 3 cups of boiling potato water from the pot into the skillet, stir well and bring to a boil. Adjust the heat to maintain an active simmer all over the pan.
Continue to simmer the sauce until the flavors have developed and the fennel is soft but not mushy, 6 minutes or more. The sauce should not get too thick: stir in another cup or 2 of boiling potato water, if it reduces rapidly. When the sauce is done, taste and add salt if needed.
Sausage Directions:
Grill sausage, about 10-15 minutes on each side.
Plate the potatoes topped with fennel onion sauce and sausage. Sprinkle the dish with fennel fronds for serving.
Notes:
This may seem like more water than you need but it gets used to make the sauce.
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