Preheat oven to 300 degrees celsius. Rinse quinoa well, place in a pot with water and sea salt, cover and bring to a boil
Reduce heat and simmer until all the liquid is absorbed.
In the meantime, thinly slice shitake mushrooms. Mix tamari, sesame oil, and mushrooms in a bowl.
Spread mushroom mixture on a baking pan and bake for 7 minutes or until mushrooms are browned but not burnt (this will depend on how thinly you have sliced your mushrooms).
Once quinoa is ready, remove from heat and stir in rice wine vinegar. Cool, add tahini to help the grain stick together.
Proceed with regular sushi making. Place nori sheet, shiny side down on a bamboo mat. Spread quinoa evenly over the first 2/3 of the sheet. Place mushrooms, daikon sprouts and shallots down the centre. Roll and squeeze tight. Slice rolls into bite size sushi pieces.