Herbs that Tonify Yin

What special cooking instruction should you follow when preparing Nu Zhen Zi (ligustri lucidi fructus) in decoction?

Nu Zhen Zi is a seed. It should be pulverized before use.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 841. [Q1145]