Clean and peel the asparagus. Cook in boiling salted water for 12-15 minutes. Drain and rinse with cold water. Drain well and let cool off. In the meantime, mix saffron and 1 teaspoon of boiling water and let it steep for about 2 minutes until the threads are soft.
Add vinegar, mustard and sugar and mix with a whisk. Drizzle the oil into the mixture. Season with salt and pepper. Clean, wash and cut the peppers into small cubes. Arrange asparagus on a plate, possibly garnished with salad leaves, and sprinkle with paprika.
Pour the vinaigrette over it and serve garnished with chervil as desired.