I've used palm sugar in various form in many beers.
Palm sugar was originally made from the sugary sap of the Palmyra palm, the date palm or sugar date palm (Phoenix sylvestris). Now it is also made from the sap of the sago, arenga pinnata and coconut palms, and may be sold as "arenga sugar" or "coconut sugar"
Sugars like that have very buttery/minerally flavor, and like you see are higher in nutritional value than processed white table sugar.
They're fun to use in beers.
I used the stuff above in my Sri Lankin Stout
I also posted some info about it and other sugars in this thread as well.
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