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Ingredients
4potatoes (I used Maris Piper)peeled and cut into 2 cm chunks
3tbspgoose or duck fat
4 halibut fillets
25gbutter
400gspinach
Butter sauce
50mlwhite wine vinegar
40mldry white wine
2tbspfinely chopped shallots
1bay leaf
1/2tspwhite peppercorns
30mldouble cream
200gunsalted buttercubed
Instructions
Preheat the oven to 230C fan. bring a large pan of salted water to the boil, drop in the potatoes and par boil for 10 minutes. Drain and shake them in the pan so they become rough on the outside. Put the goose or duck fat in a baking tray (that will fit the potatoes) in the oven until smoking hot.
When the fat is hot, add the potatoes with a good grinding of black pepper and roast for 30-40 minutes, shaking the pan half way through.
Start the sauce. In a small saucepan, add the white wine, vinegar, bay leaf, shallot and white peppercorns. Bubble until reduced to 1 tablespoons. Pass through a sieve and pour back into the pan
Prepare the halibut, use paper towels to pat off any excess moisture. season well with salt on both side. Add the butter to a non stick pan over a medium heat. When the butter is frothy, add the fillets and cook for 3 minutes, lower the heat, turn the fish over and cook for a further 2 minutes. Remove from the pan to rest in a warm place.
Finish the sauce by heating up the vinegar reduction, add the cream and a pinch of salt, let it boil for 1 minute, reduce the heat to low and start to whisk in the butter a piece at a time. Continue to do this whisking constantly, when you've used half the butter, remove from the heat and continue to whisk a few pieces at a time, taste and add some more salt if necessary and set aside.
Heat a saucepan, drop in the spinach with a generous sprinkling of salt and using tongs, move the spinach around until all the leaves start to wilt.
Divide the spinach between 4 plates, top with the fish, place some roast potatoes around the plate and finish with butter sauce.