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Export 7 ingredients for grocery delivery
Step 1
Remove the skin from the fish - the odd bone is fine as the mixture will be blended. Add the fish to the blender.
Step 2
Add the horseradish, mustard, black pepper, crème fraîche and lemon juice and blend to a paste. Add the butter and blend until smooth. Season to taste with salt.
Step 3
Serve with spring onions or sourdough bread.