Heat the oil in a large soup pot over a medium-high heat. Add the onions, bell pepper and carrots and cook, stirring until the vegetables soften, about 5 minutes. Add the cayenne, black pepper, garlic and ginger and cook for 1 minute more. Stir in the sweet potato, broth, and tomatoes and bring to a boil. Reduce the heat to medium-low and simmer until the potatoes are tender, about 20 minutes.
*Puree the soup in the pot using an immersion blender or in a regular blender in 2 batches and return the soup to the pot. Add the peanut butter and honey and stir, over low heat, until the peanut butter melts. Serve warm, garnished with the scallions.
*When blending hot liquids: Remove liquid from the heat and allow to cool for at least 5 minutes. Transfer liquid to a blender or food processor and fill it no more than halfway. If using a blender, release one corner of the lid. This prevents the vacuum effect that creates heat explosions. Place a towel over the top of the machine, pulse a few times then process on high speed until smooth.
Recipe Analysis Note: Ingredients without discrete measurements such as "Salt, to taste" or "Ice cream, optional" are omitted from analysis. This is because amounts can be highly variable and difficult to determine.