Wash and peel the asparagus and cut off the woody ends. Cut the asparagus into pieces. Cook in 1/2 l boiling, slightly salted water with sugar for 12-15 minutes
Clean and wash the mushrooms and spring onions. Wash sage, peel onion. Cut everything into small pieces. Lift out the asparagus, drain and put the stock aside
Fry onions and mushrooms in hot fat, season. Sweat flour in it. Stir in stock and milk and bring to the boil. Simmer for about 5 minutes. Dice cheese and melt in it. Heat asparagus in the sauce and season to taste