Tomatillo Avocado Salsa a la Adrienne

I attribute this recipe to Adrienne who went to a cooking class and brought it back to me. My mom loved this salsa! It is really fresh, acidic, and the charred corn gives both a sweet and roasted element that makes for an outstanding salsa. If you don't feel like roasting corn (which isn't too hard) they sell fire-roasted corn in frozen bags at TJ's. I made this salsa several times for my mom and she always loved it.