Ham that is smoked as well as cured, usually the Western kind, sold sliced or in blocks for sandwiches. Chinese hams such as Jinhua ham are dried rather than smoked.
There are a few slices of smoked ham in the sandwich.
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China has its own famous hams - 金华火腿 (Jinhua ham) and 宣威火腿 (Xuanwei ham) are salt-cured rather than smoked. 熏火腿 typically refers to Western-style smoked ham (like Black Forest or honey-smoked), and shows up most often in cafe menus and imported-style breakfasts.