I used one of Nigella's cupcake recipes but I didn't have enough sugar so I used some Stevia as well. Stevia is a natural sweetener extract from a plant called Stevia Rebaudiana Bertoni. It is a little bush that grows in Brazil and has been used as a sweetener for the past 400 years. It is much healthier then Sugar and all other food sweeteners, but for some reason it was illegal in Europe until 1 month ago and still is in the USA. Now it is available to buy in most health food shops. The only problem with stevia is that it is about 300% sweeter then sugar and only a very small amount is needed. This means that when using it for cake making it is hard to work out the corrected proportions. So using stevia is a little bit experimental for now.
Nigella's recipe says to use 125g of sugar but I only had 50g so I added 10 drops of liquid stevia and added more flour to make up the bulk. The cakes were not very sweet but I like that. Here is the recipe I came up with.