Wash the tomatoes, rub them dry and cut them in half crosswise. Press the tomato halves lightly so that the juice runs out or remove carefully with a spoon. Drain tomato halves with the cut surfaces facing down on kitchen paper.
Cut the vanilla pod lengthwise, scrape out the pulp and mix with ginger powder and salt. Mix the drained tomatoes and the spice mixture and place them close together, with the cut surface facing upwards, on 2 baking trays lined with baking paper. Dry in a preheated oven (electric cooker: not recommended/ circulating air: 125 °C/ gas: not recommended) for approx. 1 hour. Switch the temperature down (electric oven: not recommended/recirculating air: 100°C/ gas: not recommended) and let dry for another 5 hours. Let the tomatoes cool down on the baking tray. Store tomatoes in a cool, dry place.