If you're using Extra Firm Tofu, press it. If you're using Super Firm Tofu, you can skip this step.
Make the cashew queso per the recipe linked in the ingredients section.
Using a vegetable grater, shred the tofu.
Dice the red onion.
In a medium heat non-stick pan, cook the shredded tofu and diced red onion. Flip regularly to avoid burning. Tofu should end up much more dry and slightly browned.
Once the tofu is browned, add the BBQ sauce and mix everything together well.
Divide the BBQ tofu (and red onions) across three tortillas.