1 tbsp chopped chives
3 large onions, thinly sliced
8 banana shallots (echalion), thinly sliced
225g/8oz plain flour
1Β½ tbsp wholegrain mustard
pinch of salt
1 tbsp sunflower oil
salt and white pepper
60²µ/2ΒΌ΄Η³ϊ butter, cut into roughly 1cm/Β½in dice
25g/1oz unsalted butter
200ml/7fl oz double cream
4 free-range eggs
2 free-range egg yolks
60²µ/2ΒΌ΄Η³ϊ lard, cut into roughly 1cm/Β½in dice