Do you remember the chocolate lime sweets you could buy when we were little? They were a bit like marmite – you either love them or hate them, a bit like this tart. Now, I love that flavour combination but not everyone is so keen. Mr T took it into work and his colleagues weren’t so sure but both of us couldn’t resist more than one slice - hopefully you all like this!

As I mentioned previously, after making this Key Lime Pie from my Nigella Kitchen book I knew I wanted to play with the flavours and I was intrigued to see how it would work both in taste and consistency with the addition of melted chocolate. Thankfully it was a success with the bitterness of the chocolate cutting through the sweetness of the limes. I’m so pleased with how the chocolate addition worked out that I definitely think I’ll make it again for Valentine’s Day with the addition of strawberries (but minus the limes!)

Nigella's Key Lime Pie

300g chocolate digestives

1 tbsp cocoa

50g soft unsalted butter

200g dark chocolate

100g milk chocolate

1 x tin condensed milk

150ml lime juice

300ml double cream

To decorate

zest of one lime

1 square of dark chocolate grated

1 x 23cm fluted tart tin

• Pop the biscuits, cocoa and butter in a food processor and whizz until it's a sandy consistency
• Press into the tart tin taking care to push up the sides and make sure there are no holes in the base
• Pop in the fridge to firm up
• Melt the chocolate and set aside to cool
• Whisk the condensed milk and lime juice and once combined add the double cream
• Keep whisking and add the melted chocolate until smooth and thick
• Pour into the tart tin and using the back of the spoon to create a soft swirled effect
• Pop into the fridge for 4 hours to set
• Before serving scatter over the lime zest and grated chocolate