In a medium frying pan, cook ground beef until there is no pink (about 6-7 minutes).
While the beef is cooking, use a food processor or immersion blender to combine the ingredients for the avocado sauce. Mix until smooth.
If your meat isn't extra lean, you may need to drain it when it is done cooking.
Once the beef is cooked, add in corn (if frozen, do not thaw first), tomato, black beans, and taco seasoning to the pan and cook on low to medium heat for 2-3 minutes just for ingredients to warm up or corn to thaw.
Remove the beef mixture from the stove.
Place a scoop or two of the beef mixture into a piece of iceberg lettuce that is about 3-4 inches wide.
Top with a dollop of the avocado sauce and cheese, if desired. Enjoy!