1 tbsp chopped chives
3 large onions, thinly sliced
8 banana shallots (echalion), thinly sliced
225g/8oz plain flour
1陆 tbsp wholegrain mustard
pinch of salt
1 tbsp sunflower oil
salt and white pepper
60驳/2录辞锄 butter, cut into roughly 1cm/陆in dice
25g/1oz unsalted butter
200ml/7fl oz double cream
4 free-range eggs
2 free-range egg yolks
60驳/2录辞锄 lard, cut into roughly 1cm/陆in dice