Preheat the oven to 220 °C.
- Whisk all the ingredients for the Yorkshire puddings together in a bowl. Allow to rest in the fridge overnight.
- Put the dripping into pudding moulds and put in the oven until smoking hot, ladle the mix in or pour from a jug and cook for 30 minutes
- For the sauce cook out the onions until deeply coloured, add the madeira , brandy and stock into a sauce pan and bring to the boil. Reduce by half, finish with the butter and season.