I love char siu. It freezes well, so I like to make a few lbs and keep some for future use. The char siu marinade is an easy one to make. Here's my recipe (forget the fermented red tofu if unavailable. Sub with a dash of sherry.)
1 whole pork butt, about 3 lbs
Marinade:
3 Tbsp soy sauce
2 Tbsp brown sugar
1 Tbsp minced garlic
1 Tbsp brown bean sauce, optional
2 Tbsp hoisin sauce
2 pieces of red fermented tofu
1.5 tsp 5-spice powder
Basting liquid:
1/8 cup malt sugar or honey
½ cup hot water
Mash up all marinade ingredients together.
Cut the pork butt into ¾ inch slices. Combine with marinade, cover and refrigerate for 24-48 hours.
Grill the pork over medium/medium-low hot coals. Turn frequently, basting each time. Be careful not to burn; cook until well done. Let cool to handle, and slice thinly across the grain to serve.
Char siu freezes very well. Bag in batches of ½ lb each and freeze. Slice char siu and stir fry with vegetables with a little salt, white pepper, and oyster sauce or hoisin to season.