Peel the shrimps, except for the tail fin, and remove the intestines. Wash the shrimps and pat them dry. Wash and peel the asparagus and cut off the woody ends. Season salt water with sugar and lemon juice, bring to the boil, add asparagus and cook for about 15 minutes
Wash and clean the chilli and cut into fine rings. Slice the vanilla lengthwise, scrape out the pulp with the back of a knife and quarter the pod. Bring the cream, chilli, vanilla pulp and quarter of the pod to the boil and remove from the heat. Stir the sauce powder into 100 ml cold water with a whisk. Bring to the boil briefly while stirring. Switch off the stove. Cut butter into pieces and fold in. Stir in cream
Heat the oil in a frying pan and fry the prawns for about 3 minutes, turning them over. Season with salt and pepper. Arrange asparagus, sauce and prawns on a plate. Garnish with 1/4 vanilla pod each