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Cook the potato whole for about 12 mins, until tender but not cooked all the way through. Cool under cold water, then grate with the skin on – you’ll need 150g (5 ¼oz) grated potato. Tip the flour into a large bowl with a pinch of salt and crack in the eggs. Whisk until lump-free. Gradually add the milk, whisking well. Add the potato, dill and the baking powder and stir well.
Heat a little oil in a frying pan and cook 2 tbsp of the batter at a time. When you see tiny bubbles appear on the top, turn and cook on the other side for about 1 min. Keep warm while you cook the rest.
Meanwhile, mix the salad ingredients. Serve the pancakes topped with gravadlax and the mixed salad.