Due to legal reasons, hookah-tobacco in Germany may not have more moisture than 5%. Hookah-tobacco, though, is supposed to develope a huge amount of rich smoke, so it must have ca. 20-30% moisture. To draw the level, the hookah friend uses molasses with the tobacco.
Molasses is available in almost as many flavours as hookah-tobacco itself is. You can combine different kinds of flavours of the tobacco and molasses, or add e.g. apple-flavour to apple-flavour. The tobacco should be soaked in molasses for ca. 2 or 3 days to make the aroma come to it's full effect.