*The first time I made this soup, I used a hot pepper I had on hand, which I roasted along with the bell peppers. The level of heat was very mild. Just a barely-there warmth at the back of your throat as you ate, which I absolutely loved. However, I have no idea what kind of pepper it was, and when I went to replicate the recipe I couldn't find any others like it at the store, so instead I used cayenne (the beauty of cayenne is, it's easy to adjust to your own tastes, whereas using a hot pepper you never know exactly how spicy it will be). I find about ⅛th of a tsp. to be just right for me, but start with just a pinch and adjust as you see fit.
To make the peppers easier to peel, place them in a bowl right when they come out of the oven and cover tightly with plastic wrap or foil. Let sit for 15-20 minutes, or until cool enough to handle, and the steam will help loosen the skins. Sometimes I find it helpful to place the peppers skin-side up on a cutting board, and use the side of a spoon to gently rub the skin off. Try to remove as much of the skins as you easily can, but don't fuss over it too much. It doesn't have to be perfect.