1 red onion, peeled and thinly sliced
1 tsp olive oil
2 tsp soft brown dark sugar
150 g (3 oz) camembert cheese
2 garlic cloves, peeled and finely chopped
scant 1/2 (us) cup (100 ml) double cream
1/2 lemon, juice only
1 tsp fresh flat-leaf parsley, chopped
1 tsp chives, freshly snipped
4 sheets filo pastry, halved widthways
25 g (1 oz) unsalted butter, melted
salt and freshly ground black pepper