A lot of people make their chocolate smoothies with banana alone, but I find you can really taste the banana. I wanted to create a recipe where the chocolate flavor would dominate—and also that didn’t rely so much on bananas, because Hemant eats them almost every day for breakfast. I personally love this cacao smoothie with just the sweet potato—and no banana at all. I find that I still get a nice thick smoothie, and I don’t really taste the sweet potato. But for the official recipe, I went half and half. I think this variation is likely to please most palates.