Step 1 Combine the horseradish with the crème fraiche and season with salt and pepper. Keep In fridge until ready to serve.

Step 2 Grate the potato and onion and squeeze into a tea towel or paper towel to extract as much moisture as possible.

Step 3 Put potato and onion in a bowl with the rest of the rosti ingredients and mix until thoroughly combined.

Step 4 Heat the oil in a frying pan on a medium heat. Spoon the potato mix into the pan and flatten with your spatula.

Step 5 Cook for 1-2 minutes on each side until golden and crisp on the outside.

Step 6 Serve the rostis with a dollop of the horseradish cream and a generous portion of salmon on top.

Step 7 Serve with a squeeze of lemon and a few sprigs of dill.