Slice them down the middle and generously butter both of the cut sides.
Butter a glass or china ovendish.
Lay the buns down slightly overlapping, like tumbled dominoes IYSWIM.
Beat together a pint of milk, preferably not skimmed, with six eggs, a generous splash of vanilla extract, and about half a cup of sugar. Use more sugar if you like - it's difficult to make this too sweet .
Pour over the bread and place a weight on it to keep it under the milk mixture. A plate or similar shaped dish is suitable.
Leave to soak for several hours. Take the weight off, sprinkle with sugar (brown if you've got it) and bake in medium oven (about 180C) for aobut 1h or until a skewer comes out clean.
Eat hot or cold, with custard or icecream or neat. Enjoy!
You can also sprinkle raisins or choc-chips between the bunsbefore pouring the milk mix on.