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Heat the oven to 240C/220C fan/gas 9. Pour a little oil into the holes of a deep 12-hole muffin tin or 12 popover tins, making sure the oil coats the bases in a thin layer. Slide into the oven for 10 mins to heat the oil.
Whisk the flour and eggs together in a bowl with a pinch of salt until you have a smooth, thick paste. Slowly pour in the milk, whisking continuously until you have a thin batter that's the consistency of double cream.
Carefully remove the hot tin from the oven and quickly pour in the batter, filling the tins half full. The batter should sizzle immediately as it hits the oil. Bake for 10 mins, then reduce the oven to 200C/180C fan/gas 6 and bake for 10-15 mins more until the popovers are golden, crisp and well-risen. Serve straightaway.