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Heat the oven to 230C/210C fan/gas 8. Whisk the eggs, mustard powder and flour together, then gradually whisk in the milk until smooth. Stir in the horseradish.
Drizzle oil into two 12-hole muffin tins until the base of each hole is just coated. Heat in the oven for 5-10 mins, then divide the batter between the holes – it should sizzle and foam at the edges. Bake for 15 mins until risen and golden.