Heat oil in heavy medium skillet over medium-high heat. Add onion and saute until tender, about 5 minutes. Add chile, Adobo sauce and chicken and stir until heated through. Season to taste with salt and pepper.
Pull open Bolillo lengthwise. Mix mayonnaise, cilantro and cumin in small bowl. Spread mixture over inside of Bolillo. Line half of Bolillo with lettuce and half with tomato slices. Spoon chicken mixture inside. Sprinkle with cheese. Press together and serve.
c.1997, M.S. Milliken & S. Feniger, all rights reserved