Marinated mushrooms

500g mixed mushrooms, thickly sliced (oyster, shiitake, chestnut, field, portabello)

1 spring onion, dark green part finely sliced (save white part of the onion for another dish)

1 garlic clove, minced (or use 1/2 tsp garlic paste)

1 tbsp tamari/soy sauce

1 tbsp sesame oil

1 tbsp apple cider vinegar

1/2 tsp fresh ginger, minced (or use 1/2 tsp ginger paste)

1 tbsp cold water

1/2 tsp brown sugar