Combine all marinade ingredients and bring to the boil, add all vegetables and take off the heat, allow them to cool in the liquid.

Combine and purée all of the ingredients in a blender, mix until it is smooth, pass this through a fine mesh sieve, season with salt to taste.

Heat a non-stick frying pan until hot, add a little rapeseed oil and place the halibut in the pan, skin side up and turn down to a low to medium heat, leave the halibut until it is golden brown underneath, then turn onto a baking tray, skin side down.

Season it with Maldon salt and put a small knob of butter on top of it, cook it in oven for 1-2 minutes, when you are able to peel the skin easily off, the Halibut is perfectly cooked.

Bring the vegetables up to the boil, smear avocado on the base of the plate, add the sorrel leaves, then place the warm vegetables on the plate and top with the halibut, finish with slices of raw beetroot.