Thinly slice the HAIKU whole shiitake mushrooms.
In a skillet, heat a little olive oil over medium heat. Fry the mushrooms and onion for 2 to 3 minutes.
Add the teriyaki sauce and stir. Keep warm.
Open the hamburger buns. Brush the inside of the buns with a little olive oil.
Heat another skillet over medium heat. Brown the hamburger buns for 30 seconds to 1 minute on each side.
Garnish the buns with the mushroom preparation, red cabbage and lettuce.
Why not add a slice of cheese for a complete meal? A portion of 50g of cheddar add 12g of protein to your plate.