These were quite a find, outrageously chocolately and oh-so simple to make. We use Nigella's recipe (here) substituting in Vitalite for butter and using some very dark chocolate. Make up the batter, prepare the tins as instructed (can't stress how important this is), and bake for about 10 minutes.
We serve this with home-made vanilla ice cream, although Lactofree cream or Swedish Glace ice cream also work well.