Boil the noodles according to the instructions.Keep aside.
In a small bowl mix together Soy Sauce, Oyster Sauce and Lemon Juice.
In the meantime heat oil in a wok and add the onions.
Saute for about a minute and add the ginger, garlic and chilli flakes.
Cook for about a minute and add mushrooms.Let the mushrooms and get nice and golden brown and all the water has evaporated(do not add salt).
Once the mushrooms are golden add the Swiss Chard and the sauces.
Let the Swiss Chard wilt and cook for about 4-5 minutes.
Add the Soba noodles and mix together.Check the seasonings and add salt if required.Garnish with some chopped basil and serve!