A typical recipe for five-spice powder calls for szechuan peppercorns, ground cloves, fennel, cinnamon, and star anise. Other variations can be found, but the combination above is the most common (About Food, nd).
Seeing as Chinese five spice powder contains (usually) five spices, if you are allergic to any of the spices, you could have an allergic reaction. If you have an allergic reaction, contact your allergist.
Five-spice powder adds a spicy kick to dry rubs or marinades for meat, fish or poultry. It goes particularly well with pork – a traditional dish called “Five Flower Pork” consists of pork belly that is marinated in five-spice powder and other seasonings and steamed. Western versions of the dish substitute pork tenderloin or pork chops and call for stir-frying instead of steaming. Occasionally you will also see five-spice powder added to a sauce. And five-spice powder goes very nicely with tofu (About Food, nd).
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Make your own Chinese five spice with this handy recipe!