Seaweed tartar sauce. Mix 50g chopped mixed seaweed (include some pepper dulse for its garlicky taste), 4 tbsp mayonnaise and lemon juice to taste. Mix all ingredients together and serve with white fish. Foraging rules for seaweed: always harvest living seaweed attached to rocks, not washed up; cut with scissors leaving the holdfast; no coastal seaweeds in Britain are poisonous; be aware of tides and weather; check water quality of area.