This is another Swedish dish and a good use for the excellent halibut coming onto the market. My Mr
To make the aioli, boil and mash potatoes, cool and combine with egg yolks. Add a few drops of olive oil in a thin stream, whisking all the time until all the oil is mixed in. Mix the garlic and anchovies into the aioli.
Divide the fish into 4 pieces, season with salt and pepper and fry in the butter for about 1 minute each side. Grill the bread, smear with tomato relish. Put a piece of fish between each two pieces of bread and dab on some aioli, place a piece of red onion on top.
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