Step 1

Heat the oil in a large saucepan over a medium heat and add the diced onion and a pinch of salt. Cook, stirring occasionally for about 5 minutes until the onion starts to become translucent.

Step 2

Meanwhile, cook the pasta according to packet instructions in a large pot of salted water. Drain when al dente and reserve a cup of the cooking water.

Step 3

Stir the white wine into the onion and allow to simmer for about 5 minutes until the wine has reduced by half.

Step 4

Stir the creme fraiche and lemon juice into the onions and simmer for 2-3 minutes to warm through. Stir in the prawns and salmon trimmings.

Step 5

Add a splash of pasta cooking water before stirring in the pasta and rocket with the rest of the ingredients. Use tongs to give everything a good stir and add pasta water as required to get your desired consistency of sauce.

Step 6

Divide equally between two bowls and garnish with lemon zest to serve.