Cut tofu into ½ inch thick slices and lay flat on a plate
Sprinkle and spread 1 tsp taco seasoning on both sides and leave aside to marinate for 10 minutes
Spray cooking spray on a griddle and place the tofu slices on the griddle
Grill the tofu on both sides until it is golden brown
Take the grilled tofu off of the griddle and cut into bite size strips and keep aside
Put 1 tbsp oil in a wok/skillet and heat
Place onion strips into the wok/skillet and sauté for 1-2 minutes until it becomes translucent
Add mushrooms, squash, green bell pepper, red bell pepper, chopped spinach and corn to the wok/skillet
Sauté for 3-4 minutes on high heat until crisp tender
Add grilled tofu strips, black beans, salsa and the remaining taco seasoning to the wok/skillet and stir the mixture and keep aside to cool
****you can add more salsa, taco seasoning and salt according to your taste
Take out the stem from the iceberg lettuce and tap the lettuce on a chopping board to take out approximately 8-12 cups of lettuce
Fill each cup of lettuce with the mixture and serve
**Note: can be served with sour cream, guacamole and salsa