This is a dinner-party stalwart from a couple of decades back, and I like it no less than I did when I first tasted it, made by my sister Thomasina, about twenty years ago. But I have added something: I make a thin meringue base instead of crumbling biscuits into the tin. This is not hard, not even remotely, and you don't have to worry about anything since you don't want airy puffy meringue, but rather a contrastingly crackling base, with just a hint of chewy marshmallow.
Photo by James Merrell
Recipe posted by Nigella