Measure out enough orange sections to make 1/2 cup. Squeeze the juice from the remainder of the orange into the 1/2 cup of sections.
In a small saucepan, combine the orange sections and juice with the ginger. Stir in the stock, cilantro, sesame seeds, sesame oil, sugar, and salt, and bring to a boil.
Cook, whisking to break up the orange, for 10 minutes. Remove from the heat. Serve immediately or store, refrigerated, in an airtight container for up to 2 days. Reheat in a saucepan over low heat.
Yield: 1 1/3 cups