I saw Nigella make a pizza on TV with some cheese and pepperoni on it and she made the crust with a Yorkshire pudding recipe. Could you tell me where to find it?
The recipe you are looking for is Nigella's Crustless Pizza which appears in Kitchen (p26). Nigella says that whilst it isn't a pizza in the classic sense, it is very quick and easy to make on evenings when you are too tired to cook much. The base of the pizza is a Yorkshire pudding or popover batter of eggs, flour and milk which has some cheese added and towards the end of baking it is topped with cheese and either chorizo or pepperoni.
One thing to mention with the recipe is that you get the best results if you can use a metal pie dish, or if you use pyrex or earthenware then you may want to preheat the dish in the oven for a few minutes.
If you like the Crustless Pizza then you may also like to try Nigella's Meatzza from Nigellissima (p72).