Peel and finely dice the onions. Peel garlic and chop very finely. Peel, clean, wash and finely dice carrots and celery. Leek clean, wash, quarter lengthwise and chop finely.
Heat the oil in a pot. Fry the onions, garlic and vegetables in it while turning. Place the tomatoes in a large bowl and mash them coarsely with a blender.
Season vegetables with salt, pepper, sugar and paprika. Add tomato paste, stir in and briefly sweat. Deglaze with tomatoes and stock, bring to the boil and simmer for about 5 minutes. Add vodka. Season again with salt, pepper, sugar and paprika.
Wash parsley, shake dry and chop finely. Arrange soup in cups and sprinkle with parsley.