Dice Lion's Mane mushroom into large pieces. Toss in olive oil and roast in oven, with garlic at 350 degrees for 30-40 mins. Turn halfway through. The mushroom will shrink substantially as the water cooks out.
When ready, put mushroom and garlic mixture in food processor and pulse 4-5 times until mix is broken down in smaller chunks.
In a separate bowl mix together the egg, soy sauce, Greek yogurt, lemon, chopped parsley, salt and pepper. Use a whisk to evenly mix the wet ingredients. Add breadcrumbs, onions* and pulsed mushroom mixture.
*If you choose, you can saute the onions instead of using raw onions (this is optional). To do so, cook in a saute pan on medium-low with coconut oil, slowly sweating the onions until translucent (about 5-7 minutes).
Use an ice cream scoop or tablespoon (depending on the desired size of the crab cakes) to measure equal portions of crab cakes. With your hands, form into cakes.
Heat coconut oil in non-stick pan on medium heat and fry until lightly browned on both sides.
Finish with a touch of sea salt
For remoulade: Using a whisk, mix yogurt, mustard, parika, lemon juice and salt and pepper.