Cut off any excess stalks from the fennel bulbs. Cut lengthways and cut out the stalk. Cut the tuber halves into pieces about 1 cm in size. Cut 50 g ham into small pieces.
Heat 1 teaspoon butter and 1 tablespoon olive oil in a saucepan and roast the ham. Add the fennel cubes, season with salt and pepper and roast for a few minutes, stirring constantly. Deglaze with 1/2 cup of stock and simmer on open fire for another 10 minutes. Spread 30 g of grated Parmesan over the vegetables and continue to simmer with the lid closed until the Parmesan has melted.