Start by making the olive and lemon jam. Add all the jam ingredients to a pot then bring to a gentle simmer and stir to dissolve the sugar. Leave to simmer gently for around 30 minutes on a low heat until the olives begin to soften and become sticky with the sugar
Meanwhile, prepare the stuffed mackerel. Add the chorizo to a frying pan over a medium high heat and sear off until cooked through
Add in the olives, shallot, celery, dill, cornichons and garlic. Cook down until everything has softened, then add the white wine and reduce by half
Add in the fish stock along with the parsley, samphire, breadcrumbs and salt. Cook until the mix begins to thicken and dry out, adding more breadcrumbs if needed. Remove the stuffing mix from the heat and set aside
Remove the head and fins from the mackerel, lay the mackerel on a work surface then cut through the belly towards the head of the fish. Remove the guts and rinse well to remove any blood. Cut down from the head along the belly to release the first side of the fillet, next flip the fish over and repeat for the other fillet, cutting down from the head and along the belly. Slice down the spine to release the butterflied fillets, then remove the ribs and pinbone as needed. Repeat with the remaining fish
Take the butterflied mackerel and fill them with the samphire and chorizo stuffing. Wrap well with butcher's twine, making sure it’s secure at either end
Mix together all the ingredients for the caper drizzle then season to taste with salt and pepper
To cook the mackerel, add a dash of vegetable oil to a pan and season the fish well with salt and pepper. Pan fry each mackerel on one side for a couple of minutes before flipping over and cooking the other side
Turn the heat down slightly then add in the butter, lemon juice, parsley and garlic. Baste the fish in the butter mix for a few minutes until the flesh is cooked through, then remove from the heat
To serve, place the whole wrapped mackerel on a serving platter along with the watercress, lemon wedges, olive and lemon jam, and a generous drizzle of the caper olive oil vinaigrette. Serve with a sprinkle of extra parsley
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