Soak sultanas in warm water. Cut tomatoes crosswise and blanch in boiling water for about 2 minutes. Remove and rinse in cold water. Peel the tomatoes and cut the flesh into cubes.
Peel, wash and slice the carrots. Clean, wash and cut leek into rings. Heat oil. Stew vegetables in it for about 10 minutes. Peel ginger and grate finely. Squeeze sultanas.
Add sultanas and ginger to the vegetables and season with salt and chili flakes.