The most delicious use for that can of pumpkin puree in the back of your cabinet. (Yes, that one.)
Blend: In a blender, puree the first 5 ingredients.
Heat: In a medium saucepan, simmer the soup over medium-low until heated through, about 10 minutes; season.
Serve: Drizzle the soup with sesame oil. Top with scallions and sesame seeds.