These burgers have a spicy kick, but you can adjust the heat level to your taste. Just one ingredient more than plain burgers, but so much more interesting!
In a large bowl combine the beef, pureed chipotles in adobo, salt and onion. Hands are best for this.
Form the mixture into 8 patties, and use your thumbs to make slight indents in the center of each burger, which will cause them to end up flat when they cook.
Preheat the grill to medium high. Grill the burgers for 4 to 5 minutes on each side, until they are done to your liking. Serve on the buns (toasted if you wish) with lettuce, tomatoes, onions or anything you like!
Notes
Note
To make pureed chipotles in adobo, simply buy a can of chipotles in adobo sauce, dump the whole thing into a food processor and purée. The sauce will keep in a tightly covered container in the fridge for about 2 months, at least.