Finely shred Lion’s Mane into ¼” strips. In a medium bowl, mix all dry ingredients. In a second bowl, stir flax egg, mustard, vegan mayo, and hot sauce together. Using a large mixing bowl, coat the mushrooms with the dry mix, then the wet mix. If the mixture is not holding together, add 1t of water at a time. Portion the cakes into 4oz each. Fry over medium-high heat until each side is golden brown, about 5 minutes per side.