It sounds the most bizarre recipe, but we made it last night, probably took it out the oven a little early though... it was really nice though and it was so simple to make. the idea of pouring the sauce over the mix worried me, but it just ballooned into this huge sponge!
Very nice, very simple. only bit of advice is that if you think it's done, give it another minute or so just to ensure it's got a nice crispy top. Brilliant!