Very nice. I've had it using beef cubes before, but the ground beef is an interesting variation.
Super hot and spicy! At my house, that translates to "outstanding". I did find that it was more edible when I scraped the seeds and veins out of half the serranos. Even then, it still had a gratifying kick. Thanks for posting this one: It went well with the Grilled Pineapple Salad (Enchiladas) that was posted on the same day.