Peel, wash and cut the potatoes into pieces. Cover and cook in plenty of boiling salted water for about 15 minutes. Peel and chop onions and garlic. Wash the rosemary and thyme, shake dry. Wash the lamb knuckles and pat dry. Heat 2 tablespoons of oil in a large frying pan and fry the knuckles in it vigorously, turning them over. Season with salt and pepper and remove. Add the onions and garlic to the hot frying fat and fry gently. Stir in tomato paste, deglaze with wine and tomatoes. Add knuckles and herbs, bring to the boil once and simmer covered for 1 1/2-2 hours. Turn the knuckles once in between. Drain potatoes and let them cool down.
Wash the asparagus, cut off the woody ends. Clean the carrots, leave some green. Peel the carrots, possibly cut them in half lengthwise. Cook the asparagus and carrots in boiling salted water with sugar for about 8 minutes. Drain, quench and let drain.
Heat 1 tablespoon butter and 1 tablespoon oil in a large frying pan. Fry the potatoes until golden brown, season with salt and finally sprinkle crumbs over them and brown. Heat 2 tbsp. butter in a second pan. Fry the asparagus and carrots. Sprinkle with cheese and lemon peel, season with salt. Season to taste the sauce. Arrange the lamb knuckles with the sauce on a deep plate. Add vegetables and potatoes.