Cut lengthwise around middle of avocado; twist avocado to separate halves; strike pit with a knife blade to remove; scoop out pulp with a spoon.
In a small bowl, mash avocado.
To assemble tortas: Spread mashed avocado on cut sides of rolls, dividing evenly. Sprinkle with salt and pepper. On bottom halves, layer sliced chicken, lettuce, tomato, black beans and jalapeño pepper slices. Firmly press tops of rolls on tortas.Servings: 2