In a large skillet heat butter, ghee or olive oil on medium high heat.
Once melted, add the mushrooms, salt to taste and sauté for approximately 10 minutes.
Remove mushrooms with a slotted spoon and set aside.
In a separate skillet heat bacon grease (or other cooking oil of your choice) in a large skillet on medium high heat.
Once the oil is hot add your onions and cook for roughly 5 minutes and add ground beef and begin to brown.
After 5 minutes add the chili powder, smoked paprika, salt and pepper and thoroughly combine all ingredients and cook until done, another 5 minutes or so.
Once ground beef is cooked and browned add previously cooked mushrooms and combine.
Serve meat and mushroom mixture in cleaned leaf of romaine lettuce (or tortilla for the infidels ;) ) and top with additional ingredients to your liking, especially the chimichurri sauce! Eat like a taco and get your grub on!