Quarter the peppers and cabbage and remove the stalk, then grate finely. Finely dice the onions and place in a large bowl with the cabbage and paprika.
Put the sugar, oil, salt, pepper and herb vinegar in a second bowl and mix carefully with the mineral water (foams) until the sugar has dissolved. Pour the dressing over the salad and cover with a plate or with a smaller lid than the bowl is, and weigh down.
Let the salad stand for 24 hours. Pour off the liquid before serving, the salad will still have enough liquid.
Very tasty with gyros or grilled. The lettuce will keep for a few days in the refrigerator.