For the supreme di polio ai germogli, carefully remove the chicken breasts, cut the breasts in half (suprême). Rinse the lemon with hot water and rub dry. Peel the lemon peel thinly with a zester, squeeze the juice.
Chop the sprouts. Also finely chop the sections from removing the chicken and mix with the sprouts. Season with salt and pepper. Form the mixture into dumplings. Place the suprême on the work surface and top each with a dumpling. Roll up the suprême and pin the ends with toothpicks.
Line a baking dish with some lemon zest and place the rolled suprême on top. Pour olive oil over them and bake in a preheated oven at 180 °C for about 25 minutes. After 10 minutes, deglaze with white wine.
Take out the supreme di polio ai germogli and wrap in aluminum foil. Leave to rest in the warm oven.
Mix the gravy in a pot with lemon juice, a yolk and cream. Let it boil down a bit and pour it over the supreme di polio ai germogli. Serve with chopped parsley.