Unless you've been living under a rock (or in Sheepshead Bay), you'll
know that a chipotle is a smoked jalapeno. You can find them dried
(just like their tomato predecessors), but more commonly they come
stewed in a can with adobo, a vinegary tomato based sauce. I usually
remove the seeds before using, that way you can use more chipotles
without adding too much heat.