Chipotles in adobo sauce are dried smoked red jalapeno peppers, which are canned with a thick chili puree called adobo. They can be found in the Mexican section of your local supermarket. Like all hot peppers, handle these chilies and their sauce with care so they don't burn your skin or eyes. Unused chipotle peppers can be frozen. Individually freeze the peppers with some sauce on a lined baking sheet, then store in a resealable plastic freezer bag for up to 3 months.