Black sesame soup is widely found Chinese dessert soup, with a foreboding appearance but a lovely, nutty and subtle flavor. It's also quite easy to make (large quantities of) so it's a great dessert for when you have to serve a large group of people.
1/2 cup white rice
1/2 cup black sesame seeds
4 cups water
1/2 - 3/4 cup brown sugar (or more to taste)
pinch of salt
Soak the rice in water for several hours or overnight.
Toast the sesame seeds on low heat in nonstick frying pan for 5 - 10 minutes, and set aside to cool. Grind the sesame seeds using a blender or food processor, until they form a paste. Remove from the blender.
Rinse out the blender. Remove the excess water from the rice (reserving a bit to help blend the rice), then also grind until smooth in the blender.
Mix the blended rice, sesame paste and water in a pot. Bring to a boil, stirring constantly. Lower the heat and continue stirring. Add the sugar and a pinch of salt and simmer for 5 to 10 minutes, until the soup starts to get an even, smooth consistency. Taste and adjust sugar/salt.