Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Clean and wash the fennel and cut lengthwise into slices. Peel garlic, press lightly. Clean the pepperoni, cut in half lengthwise, remove seeds, wash and cut into pieces.
Wash the rosemary and shake dry, remove the needles.
Mix fennel, garlic, pepperoni and rosemary with wine, olive oil, approx. 1 teaspoon salt and pepper. Spread on four pieces of baking paper in the middle. Take the paper all around the filling and close it.
Place the package on a tray. Bake in a hot oven for about 25 minutes.