If you want some of the best quesadillas in LA, you have to go to the blue corn quesadilla lady in Echo Park. She's right off Sunset Blvd on Echo Park Blvd. to the west most weekdays for lunch. Look for the cart with the rainbow umbrella at the edge of the parking lot behind El Clasico Tattoo.
She makes fresh blue corn tortillas by hand then fills them with cheese and other goodies. Definitely try the Papas con Chorizo (Potato and Mexican sausage). The squash blossom and mushroom are grub too! You can also get a danger dog (LA street hog dog wrapped in bacon). Eat in LA for under $5. Oh yeah.