Salmon gravlax with horseradish

Sprinkle half the salt, sugar and chopped lemon zest onto a flat tray and place the salmon fillet on top with the skin-side up

Sprinkle the remaining salt, sugar and lemon zest over the salmon fillet evenly and marinate for 1 hour

Once the salmon has cured, wash the mixture off with cold water and pat dry

Pour the olive oil into a saucepan and warm up to 45-50°C. Cook the salmon in the oil for 10-12 minutes

Once cooked, remove the salmon from the pan and place onto a tray to cool and drain. Flake the salmon and set aside

To make the horseradish and mustard sauce, mix the mustards, sugar, salt and horseradish sauce together until the sugar has dissolved. Mix in the Greek yoghurt, then cover the mixture with cling film and leave in the fridge until ready to use

Preheat the oven to 160°C/gas mark 3

Slice the rye bread and put onto a tray lined with parchment paper. Season the bread with a little olive oil and salt and bake in the oven for 5-6 minutes or until crisp

Sweep the mustard sauce on the croutes and add the flaked salmon on top, then serve