Put the vegetable stock in a large saucepan with 400 ml of water.
Peel and dice the potatoes and carrots. Peel the ginger and cut into slices. Peel the garlic but leave it whole. Peel the shallots and leave whole if they are really small. Otherwise halve at most and add everything together in the gently simmering broth. Also add the marjoram and bay leaves. Let simmer for about 10 minutes. At the same time cut the leek into rings and add to the broth after 10 minutes. Salt carefully and add the black cumin. Let simmer gently for another 10 minutes. When the consistency of the vegetables has the desired firmness, turn off the stove.
Remove the ginger, bay leaves and, depending on your taste, the cloves of garlic. Add the olive oil and, if necessary, freshly ground pepper.
Tip: The soup can be more filling with additions such as B. Kritharaki (Greek durum wheat noodles) cooked separately.