1 pound tart apples cored cut into 1/4-inch pieces
Equipment
pot
immersion blender
Directions
Heat olive oil in a large soup pot over medium heat; cook and stir shallots in the hot oil until soft, about 3 minutes. Stir apples, ginger, zest from 1 lime, red pepper flakes, and cayenne pepper into the pot. Reserve lime juice. Cook and stir mixture until apples are very soft, about 15 minutes.
Pour chicken broth into pot; add sweet potatoes and salt. Cover and bring to a boil. Reduce heat to low and simmer for 10 minutes. Puree soup with an immersion blender until smooth. Stir reserved lime juice into soup.