1Drain rice, or chosen grain. Add to blender and blend thoroughly with 3 cups water. Remove from blender and set aside.
3Drain sesame seeds. Toast in frying pan on low-medium heat, 1-2 minutes, until fragrant.
5Add seeds to blender with ~3/4 cups water, and blend thoroughly.
7Add rice mixture back into blender (along with optional walnuts) and mix thoroughly.
9Transfer mixture to a pot, combined with sugar and the rest of the water.
11Bring to a boil, then simmer on low until thickened (5-8 minutes). Stir frequently to prevent sediment from sticking to bottom of pot and burning.
13Add more boiling water to adjust thickness, if desired.