Wing Wah Cake Shop sells mooncakes, lotus seed pastries, low-sugar products, and Hong Kong-style sausage. It sits on the first floor, reached by a staircase next to a Citibank branch in Mong Kok. The double-yolk lotus seed mooncake has a thin, soft crust filled with finely ground lotus seed and salted egg yolk. Duck leg meat and cut duck are sold vacuum-packed in a refrigerator, and the entrance beside the Citibank branch is hard to spot because the staircase is narrow.