Lemon sure seems a natural - I was waiting to taste my batch and I have lactic acid ready to add if it does not sour enough to my taste, but with the lemon syrup option, I may go that route to let everyone pick their choice and level of sour....plus I think I will try the souring route mentioned in the Berliner Weisse recipe on my next batch. It will be done more quickly than my blended yeast and lacto pitch, where I am waiting months. Prosit!