Quesadillas with Black Beans & Tofu, Huitlacoche, & Rajas

I used to live in Los Angeles, where I worked in a photographic lab printing pictures by famous photographers. Every morning a Mexican food truck would pull up at about 11 A.M. and I’d order a cheesy green chile quesadilla. Heaven! At that time I was going to the gym every day doing Jane Fonda-style “aerobics”— remember them?—so I could afford to eat my body weight in fat ‘n’ carbs. This is a vegan version, equally tasty but rather healthier. Huitlacoche is a fungus that grows on corn, whic