ASDA part of the Wal-Mart family

• 425g shortcrust pastry
• 1tbsp olive oil
• 15g butter
• 500g red onions, thinly sliced
• 1tsp caster sugar
• 1tbsp balsamic vinegar
• 3 large free-range eggs
• 300ml single cream
• 125g Double Gloucester cheese, grated
• salad and jacket potato, to serve

1 Preheat the oven to 200C/180C Fan/Gas 6. Roll out the pastry on a lightly floured surface and use to line a 23cm flan tin. Prick the base and lay a sheet of baking paper inside to come above the edges. Weigh paper down with rice and bake for 10 minutes. Discard the paper and rice and return flan tin to the oven for another 4 minutes. Reduce heat to 180C/160C Fan/Gas 4 and take out the flan tin.

2 Put the oil and butter in a pan and cook the onion on a low heat until starting to turn golden. Sprinkle in the sugar and balsamic vinegar and cook, stirring occasionally, until deep golden brown.

3 Put the onion in the flan case and season well. Lightly beat the eggs and cream together and stir in the cheese. Pour over the onions and cook for 30 minutes.

4 Serve with mixed salad and jacket potato.