Stilton & Walnut Tart

Directions

1. 1
   Preheat the oven to 200°C/gas6.
2. 2
   Peel the onions and thinly slice them.
3. 3
   Heat the oil in a large frying pan, add the onions and fry until softened and lightly browned, stirring occasionally.
4. 4
   Splash in the vinegar, season, then cook for a further 5 minutes until lightly caramelized. Leave to cool while you prepare the pastry.
5. 5
   Use the pastry to line a 9x13 in oblong tin.
6. 6
   Spread over the onions, then crumble the Stilton on top and scatter with walnuts. Bake for 15-20 minutes, until the pastry is crisp , golden and the cheese has melted.
7. 7
   Cool the tart for 5 minutes before serving cut into squares.