This must be one of the easiest recipes I have seen for something that looks so elegant and complicated. Thanks to Nigella Lawson for this gem.
You don’t spend long making it, can do it it ahead of time and everyone thinks you’re a genius! I’ll take it!

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For the meringue gelato cake
1 ¼ cups heavy cream
1 oz bittersweet chocolate (minimum 70% cocoa solids)
1 tbsp coffee liqueur (and/or rum)
4 oz shop-bought meringue cookies
8 oz raspberries (to serve, optional)

For the chocolate sauce
1 cup heavy cream
⅔ cup bittersweet chocolate (minimum 70% cocoa solids), finely chopped
2 tbsp coffee liqueur (and/or rum)

For the Meringue Gelato Cake:
Line a 450g / 1lb loaf tin with clingfilm, making sure you have enough overhang to cover the top later.
Whip the cream until thick but still soft.
Chop the chocolate very finely so that you have a pile of dark splinters, and fold them into the cream, along with the liqueur.
Now, using brute force, crumble the meringue cookies and fold these in, too.
Pack this mixture into the prepared loaf tin, pressing it down with a spatula as you go, and bring the clingfilm up and over to seal the top, then get out more clingfilm to wrap around the whole tin. Freeze until solid, which should take around 8 hours, or overnight.

To serve, unwrap the outer layer of plastic wrap, then unpeel the top and use these bits of long overhanging wrap to lift out the ice-cream brick. Unwrap and unmould it onto a board and cut the frozen meringue cake into slabs to serve. I like to zig-zag a little chocolate sauce over each slice, and sprinkle a few raspberries alongside on each plate.

For the Chocolate Sauce:
Pour the cream into a saucepan and add the tiny bits of chocolate.
Put over a gentle heat and whisk as the chocolate melts, taking the pan off the heat once the chocolate is almost all melted. If the mixture gets too hot, the chocolate will seize, whereas it will happily continue melting in the warm cream off the heat.
Add the liqueur, still off the heat, and whisk again to amalgamate the sauce completely. Pour into a jug, whisking every now and again until it cools to just subtly warm.