This cake is light, fluffy and captures the distinctive flavour of those little caramelised biscuits perfectly. It pairs beautifully with a cup of coffee. Preheat the oven to 160C/140C Fan/Gas 2½.

If you are worried about the planet, and want to do your best to protect it, then choosing what to buy and eat can be a minefield. I think the message has got through by now that vegetarian ...