With Spring on the way, we are all looking forward to lighter, fresher food, this recipe is far fresher and lighter than traditional lasagne and ready in just 20 minutes.
Cook the beans for 2 minutes in boiling salted water, drain and refresh in cold water. Remove the tough outer skins.
Cook the lasagne, 2 sheets at a time, for 2 minutes in a big pan of boiling salted water. Drain and drizzle with olive oil.
Meanwhile, heat the oil in a pan and cook the garlic for 30 seconds. Add the prawns, crème fraîche and zest and cook for 2-3 minutes until the prawns are cooked. Take off the heat.
Stir in the beans, Parmesan, lemon juice and mint, then season to taste.
Put a pasta sheet on each plate, top with some prawn mixture, add another sheet, then finish with the rest of the mixture, a drizzle of olive oil and some Parmesan shavings.