by Nigella Lawson

I have always avoided making chocolate tarts because I have never really felt that the pastry served the chocolate, or was worth the effort. This is my simple solution: make a base out of chocolate biscuits. And the filling is just as easy to make, too. I never lie about how effortless something is to make, but no one will believe me on this one.

For this recipe you will need a 23cm/9in deep-sided (approx. 5cm/2in deep), loosebottomed flan tin.

Cakes and baking

Buyer's guide

According to the experts, a good dark chocolate should contain at least 70 per cent cocoa solids to deliver the desired chocolate hit, but chocolate made from 100 per cent cocoa solids is available from speciality chocolate shops. It is extremely bitter and an acquired taste.

Storage

Properly stored, dark chocolate will keep for a year.

Preparation

Dark chocolate can be dairy-free and suitable for vegans. European law does not recognise the adjectives ‘dark’ or ‘plain’ usually added to this chocolate; it’s just known as ‘chocolate’. Dark chocolate should contain a minimum of 35% cocoa solids, at least 18% of which should be cocoa butter. However, the cocoa content can be, and often is, much higher than this, and can reach up to 80% and even 90%. High-quality dark chocolate has a more bitter taste than chocolate confectionery. It can be eaten as a snack or incorporated into rich cakes, sauces or desserts.