Peel the asparagus, cut off the woody ends. Cook the asparagus in boiling salted water for 10-15 minutes. Meanwhile clean the carrot and courgette. Peel the carrot. Cut carrot and zucchini into strips.
Peel and finely chop the onion. Melt the butter in a hot pan and sauté the onion. Add vegetable strips and sweat along. Add stock and stew for 5-10 minutes. Wash the prawns, dab dry and season with lemon juice, salt and pepper.
Heat the oil in a frying pan and fry the prawns for about 3 minutes, turning them over. In the meantime, remove the asparagus, add to the vegetables and keep warm. Wash the basil, dab dry and, except for something to garnish, pluck.
Cut the basil into strips and sprinkle on the prawns. Arrange asparagus with vegetables and prawns on a plate and garnish with the rest of the basil.