Does anyone use their immersion blender in their Le Creuset dutch oven? It is so much easier to blend as soup with my immersion blender rather than transfer everything in batches to a food processor or blender but I am afraid of ruining my gorgeous pan. I used it last night (trying to avoid the bottom) and feel like the enamel on the bottom of the dutch oven is now duller than before. Curious about all your thoughts. Thanks!!