Prepare fresh halibut and clean all ingredients as listed.

Slice king oyster mushrooms into circular shapes and pan-fry with butter, olive oil, salt, and pepper.

Dice the remaining ingredients (onion, avocado, crab stick, halibut) into small cubes.

Using a round mold, layer mushrooms, onion, avocado, crab stick, and halibut in sequence.

Place the stacked towers on a plate and garnish with sprouts.

Mix olive oil, wasabi, minced garlic, and optionally soy sauce to create a dipping sauce.