Heat olive oil in a heavy-bottomed saucepan or dutch oven over medium heat. Add the leeks, garlic, and red pepper and saute until the leeks are translucent, about 3 to 5 minutes. Add the chicken stock and bring to a boil. Add white and sweet potatos, and return to a boil. Reduce the heat and simmer gently until the potatos are tender, about 20 to 25 minutes.
Cool slightly. Puree in a blender or food processor until smooth and return to the pot. Bring the puree to a simmer, then reduce the heat. Stir in the curry powder, garlic powder, turmeric, lemon juice, and mint. Simmer for another 3 to 5 minutes until the flavors have mingled. Serve hot with a sprinkle of chopped peppers.
Posted by Alison Meyer. Courtesy of Fred Peters.