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In a small mixing bowl, mix ¾ cup mayonnaise with 3 tbsp of Lion's Mane Piri Piri. Set aside in the fridge. Slice mushrooms, onion, and garlic, and set aside.
Heat a pan over medium high heat, add butter, sliced onions, and salt. Cook until caramelized. Remove from pan.
Add more butter to the pan, then mushrooms, salt, and cracked black pepper. Once softened, add garlic and Lion's Mane Piri Piri. Add the cooked onions back to the pan.
Mix ground beef with salt, pepper, and Lion's Mane Piri Piri. Form patties, cook them in the pan, adding American cheese slices to melt. Toast hamburger buns.
Build the burger by layering patty, mushroom topping, American cheese, another patty (optional), and Piri Piri mayo mixture on toasted buns.