Soak raw cashews in warm water for at least 4 hours or preferably overnight

Drain and rinse cashews

Place cashews and all other sauce into a high-speed blender

Blend until a smooth, evenly mixed sauce remains

Dice the yellow onion

Preheat the oven to 350F

Pour 1 tbsp avocado oil into a frying pan and heat over medium-low heat

Add the onions to the pan and cook over medium-low heat until soft and fragrant - about 4 mintues

Add ground beef to the pan and increase the heat to medium

Brown and break up ground with a wooden mixing spoon for about 4 minutes

Add salt and pepper to the pan with the onions and ground beef

Cook the ground beef for an additional 4 minutes until cooked into crumbles

Remove the frying pan from the heat and drain the excess oil from the pan

Peel and cube sweet potatoes into small 1/2" cubes

Toss cubed sweet potatoes in 1 tbsp avocado oil

Assemble casserole in a small 6x9 baking dish

Grease the casserole dish and press the ground beef into the bottom of the casserole dish in an even layer

Pour cashew sauce over the ground beef and smooth into an even layer with a spatula

Place a layer of cube sweet potato over the top of the sauce and press the sweet potatoes into the sauce

Season the top of the sweet potatoes with coarse sea salt and fresh ground pepper

Place casserole into the oven and bake at 350F for 1 hour and 10 minutes

Remove from the oven and allow the casserole to cool slightly before eating

Serve with your favorite taco toppings like shredded lettuce, guacamole, salsa, and jalapenos