Wash the asparagus and cut the ends off generously. Cut the stalks into 3 pieces each. Peel and finely chop the onions. Wash lemon hot and grate the peel finely. Squeeze the juice.
Fry the onions in 8 tablespoons of hot oil. Sprinkle with sugar and caramelize lightly. Stir in tomato paste. Add lentils and lemon peel. Stir in 100 ml water, lemon juice, vinegar and stock. Bring to the boil, simmer for about 15 minutes.
Season to taste with salt, pepper and chilli. Let it cool down.
Grate cheese. Heat 2 tablespoons of oil and butter in a large frying pan. Fry the asparagus for 2-3 minutes. Take them out and let them cool down. Arrange asparagus with lentil vinaigrette in 12 small glasses.
Sprinkle with cheese.