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Preheat your oven to 190ºC.
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Put your pastry on a baking paper (if it isn’t already done) and line it in your tin. Gently prick the base all over with a fork.
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Combine the onions with the olive oil in a frying pan and leave to cook over a medium heat during 15 minutes stirring every now and then. They should become translucent but not brown.
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Meanwhile, poor the white wine over the bread and mix with a fork until you get a liquid batter. Add the crème fraiche, flour, milk and egg and mix until smooth and well combined.
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Add the cooked onions to the mixture and poor everything into the pastry case.
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Bake for 45 minutes until the pastry edges are golden and firm. Serve warm or cold.