1) Preheat the oven to 200C/Gas 6.
2) Leave 2 tablespoons of the drippings in the roasting tray and place in the oven.
3) Place the flour, salt, eggs, milk and remaining 2 tablespoons of drippings into the bowl of a food processor or blender and process for 30 seconds. Pour the batter into the hot roasting tray and bake for 35 to 40 minutes or until puffed and golden brown. While the pudding is cooking, carve the roast.
Serve the pudding with the roast.
Cook's note: A three-bone-in standing rib roast cooked in a 33 by 23-cm roasting tray will give you enough drippings for the pudding. Prepare the pudding while the roast is resting.