Break lettuce into a large salad bowl. Brown hamburger and drain. Return hamburger to skillet and add chili beans and heat. Pour over lettuce. Cut onion into rings, add to salad. Then add shredded cheese and tomatoes. Crush tacos on top and toss lightly. Can sprinkle salsa over top of salad to add more zest. You an also add sour cream or top with a little ranch dressing. Very versatile taco salad with many options.