Parmesan cheese in shavings. Peel and chop the garlic. Wash rocket and herbs and shake dry. Remove the leaves of the herbs. Puree the herbs, rocket, garlic, half of the Parmesan shavings and 50 ml oil. Season to taste with salt and pepper
Wash the shoulder of lamb, dab dry and season on both sides with salt and pepper. Spread the pesto on the inside of the shoulder of lamb and sprinkle with remaining Parmesan shavings. Form the meat into a roll and tie together with kitchen string
Place the roast in an ovenproof dish. Spread butter in pieces on top. Pour on the stock and cook the roast in the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see manufacturer) for approx. 1 1/2 hours, pouring over regularly
Wash and clean the pâtisson pumpkins. Heat 2 tablespoons of olive oil in a frying pan. Fry the pumpkins for about 8 minutes, turning them lightly. Season with salt and pepper. Remove roast from the oven and remove kitchen string. Cut meat into slices. Arrange roast with gravy and pumpkins on a plate and serve immediately