Roast Halibut/Brioche & Herb Butter Crust

To make the herb butter

Strip the leaves from the parsley, chop roughly and place into the bowl of a food processor and whizz well. Add the softened butter and drained capers. Gently roast the fennel seeds in a dry frying pan until lightly coloured (this helps to enhance the flavour) and place these in the food processor with the snipped chives and a good s