Hua Jiao Fen.1
The product of grinding cooked peppers with mortar and pestle. It was the spice that represented Chinese cuisine. It was said the pepper powder of Sichuan was exceptionally hot, spicy, and aromatic. It could burn through your tongue.
Needless to say, it was an essential ingredient of Mapo Tofu.
- ^ Apparently Nasu wanted to emphasize this is the specific type of pepper found in Sichuan cooking.