When using fresh tomatoes, a pinch of sugar makes all the difference

Tomatoes are not only an eye-catcher on every salad, but also taste wonderfully aromatic. Stored in the fridge, however, they can lose their aroma. — Photo: Zacharie Scheurer/dpa

Roma, panicle, cherry or cocktail - there are more than 3,000 varieties of tomato worldwide and no matter what kind you are preparing, all are packed with vitamins and low in calories.

Tomatoes taste best when fully ripe, says a German association of fruit and vegetable producers (BVEO), so ideally, try to find some that were grown locally, rather than ones that have travelled a long distance.