This is what I ended up calling Doldrums Soup:
*Cut 1 medium sweet potato into 1 inch chunks.
*Bring 1 cup of water to a boil, and add 1 bouillon vegetable cube. (Or use 1 cup of low-sodium vegetable broth instead)
*Bring broth to a boil in a small saucepan, and add sweet potatoes, cooking until fork inserts into them easily (but not too easily, we don't want mush)
*In a larger pot, heat chopped scallions and 1 tbsp water over medium heat
*Add rice after about a minute and stir briefly
*When potatoes are cooked, pour the contents of that pan in with the rice and scallions. Stir and season as desired (sea salt, pepper)
Mixture will be more like a stew than a soup. Serves 1. Fuels well for a night of book-reading and floor-sprawling.