Combine soy sauce, sesame oil and rice vinegar in a bowl. Add sliced mushrooms and then add to a skillet on medium heat. Cook until soft.
Coat toast in olive oil and cook in a pan for 2-3 min per side.
Peel half and avocado and mash in a bowl with furikake, a little dash of sesame oil. Spread on top of bread.
Add radishes on top of avocado and then top mushrooms. Finish with sesame seeds and enjoy!