Preheat the oven to gas mark 6 / 200c. Remove the puff pastry from the fridge around 20 minutes before use.

Cut the unrolled puff pastry into quarters. Lay the trimmed fish fillets across the middle of each quarter. Trim the pastry either side of the fish with diagonal 1 inch cuts.

Spread a tablespoon of pesto across each salmon fillet. Wrap the diagonal cuts of pastry around the salmon.

Brush the tops with melted butter and bake in the oven on a lined baking sheet for 20 minutes.