Caramalised Onion Tart

4 good sized brown onions thinly sliced
1 dtsp brown sugar (optional)
2 tblsp balsamic vinegar
1 sheet ready made puff pastry

Cook onions slowly in frypan for 30-45 minutes with a little olive oil then add balsamic vinegar and sugar if you are using it and cook for a further 15 minutes.

Score a line all the way round the puff pastry, an inch inside the edge.
Pile the cooked onion inside the line and cook for 25-30 minutes in medium oven (180c) until the pastry is golden and puffed.
Serve warm or cold.

Alternatives:

• Use 4-8 sheets of filo pastry, sprayed with olive oil, instead of the puff pastry
• Add crumbled fetta (before cooking) and/or thinly sliced sundried tomatoes (after cooking) to the top of the tart.