Using a food processor, finely chop whole walnuts and cauliflower florets until they resemble minced meat.
Combined minced cauliflower and walnuts in a large bowl with the rest of the ingredients on the list, except for the oil.
Heat a large cast iron skillet over medium-low for 5 minutes.
Add the 2 tablespoons of avocado oil to the hot skillet, and dump the entire bowl of ingredients into the skillet. Spread it out into one layer and cook undisturbed for 5 minutes.
Stir the mixture and flip it, and cook another 5 minutes undisturbed.
Stir a third time, and allow to cook for a final 5 minutes.
While the meatless beef is cooking, begin chopping, slicing your toppings.
When the meatless beef is finished cooking, remove from the heat and drizzle with a squeeze of lime.