Oct. 27, 2011: I made this again today, and I've changed the instructions so you make the filling first. This is delicious for a buffet table, or served as starter slices, nicely plated. The recipe is easy, it's a "won't fail" one, and satisfyingly creative.
A fully descriptive title was too long to fit in: the filling also specifies either thin ham, or thin smoked salmon slices, or ditto, salami. A salsa or parsley sauce can be served with it if you like. I have changed the original recipe (from the ex-A la Carte UK magazine) beyond recognition, and my version is far tastier. (And oh yummy, a slice warmed lightly, with a fried egg on top, makes a great breakfast! The recipe is also low in carbs and diabetic safe). DO make the FILLING first.