Notes: Sherry is a type of fortified wine originally from southern Spain. Don't use the “cooking sherry” sold in many supermarkets--it can be surprisingly high in sodium. Instead, purchase dry sherry that's sold with other fortified wines in your wine or liquor store.
Boneless duck breast halves range widely in weight, from about 1/2 to 1 pound, depending on the breed. They can be found in most supermarkets in the poultry or specialty-meat sections.
Often a blend of cinnamon, cloves, fennel seed, star anise and Szechuan peppercorns, five-spice powder was originally considered a cure-all miracle blend encompassing the five elements (sour, bitter, sweet, pungent, salty). Look for it in the supermarket spice section.