Wash the meat, dab dry and cut in half lengthwise. Place them side by side on a work surface. Season with salt and pepper. Spread with herb butter and sprinkle with parmesan. Roll up and stick together with wooden skewers.
Heat 2 tablespoons of oil in a large frying pan, fry the rolls in it vigorously while turning. Deglaze with stock and sherry, bring to the boil, cover and stew for about 15 minutes. Meanwhile wash ##Asparagus##, cut off woody ends.
Cut the asparagus into pieces. Cook in boiling salted water with sugar for 6-8 minutes. Pour carefully into a sieve and drain. Wash and drain the tomatoes. Heat 2 tablespoons of oil in a pan, melt the tomatoes in it while turning.
Season with salt and pepper, add asparagus and heat again. Keep warm. Remove rolls from the stock and keep warm. Bring the stock to the boil again. Stir starch and 4 tbsp. water until smooth. Stir into the boiling stock, bring to the boil again, season with salt, ##pepper## and sugar.
Add the rolls again. Arrange rolls with sauce and vegetables on a plate. Garnish with basil. Roast potatoes taste good with it.