Put in a small saucepan and mix the soy sauce, sherry, rice vinegar, ginger, and sugar. Let the marinade reduce by half over medium heat. It should be about 1/2 cup. Let it cool.
Put the mushrooms in the marinade in a bag and leave them in the refrigerator for one hour.
Mix the 2 tablespoons of mayonnaise with the 2 teaspoons of rice vinegar, sesame oil, and honey. Season with salt and pepper. Add the grated carrot, cabbage, and finely chopped green onions. Season with salt and pepper.
Dry the portobello mushrooms and grill them for 3 minutes on each side. Lightly toast the hamburger buns and place one mushroom on each. Serve the portobello burgers with the coleslaw mayonnaise.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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