Article in English: Place the mustard seeds, bay leaves, and Allspice berries in a mortar and grind them together using a pestle. If you do not have a mortar and pestle, you could use the handle of a meat tenderizer or other utensil and a small dish, like a custard dish or ramekin. Similarly, you could place the spices in a resealable plastic bag, seal it, and crush them with a rolling pin. In a small mixing bowl, stir together the ground spices with the salt and pepper until each spice is evenly distributed.  The spices can be mixed together with a spoon or fork. Set aside once combined.

Summary in Chinese:
捣碎芥末、苗月桂叶和多香果。 把所有调料拌匀。