Made my own version over the weekend
after seeing this.
Have to admit I just bought frozen giant yorkshire puddings, and let the kids (4 and 2) make there own pizza in a "orkshire pud" as they call them. So they had fun.
Turned out pretty well, passata and tomato puree mix for the base, loads of pepperoni, cheese and salami, the missus had mushrooms on her's too.
I added a bit of cayenne to the cheese mix for mine.
Served with a dessert of jaffa cakes :-D