Pulse shiitake mushrooms in a food processor/or blender until small (from small minced pieces - to the size of small lentils) - set aside
Pulse walnuts the same as the shiitake mushrooms - set aside
Heat a large skillet on low-medium heat
Add olive oil to warm
When the oil is warmed, add shiitake mushrooms and saute for about 5 minutes
Then add walnuts and saute for another 1 minute
Add spices and saute for 2 minutes
Add salsa, lime juice, liquid aminos and tomato paste - stir to combine for 2 minutes
Take your spatula/spoon and press the crumble firmly into the skillet - making an even layer at the base of the skillet (this is to crisp the crumble)
Allow to sit for a few minutes, then repeat once more before removing from heat
Serve warm!