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Heat oven to 200C/180C fan/gas 6. Heat the oil in a frying pan, then gently fry the leeks until soft, about 5 mins. Cool. Unroll the pastry onto a baking sheet. Spread the soft cheese over the pastry to within 3cm of the edges. Scatter over the leeks, bacon and grated emmental.
Flip the edges of the pastry over the filling. Bake for 20 mins until golden.