Saute onion and garlic in oil over medium heat. When translucent, add the greens and a Tbsp. or so of water just to help them steam.
In the meantime, prepare tortillas, being careful not to overcook: steam, microwave, quickly fry in a dry skillet, etc. Serve the greens and toppings in separate bowls with tortillas wrapped in a towel, on the side.
