Simple Mutton Soup

400-500 g of diced mutton / lamb
red onion and garlic (as much as you like) - thinly cut
a few celery stalks 
4-5 dried mushrooms
white pepper
oyster sauce
corn flour
water
1-2 tablespoon of oil
salt

1.  Pour the oil into the pot and saute the onions and garlic till golden brown
2.  Immediately, put the diced mutton into the pot and keep on stirring to caramelize the meat.
3.  Pour in water (or even better, chicken or mutton stock), as much as you want, but I prefer to have the level just slightly above the mutton chunks.
4.  Put the mushrooms, oyster sauce, pepper and a bit of corn starch. And leave it to simmer (oh I don't know how long, it is really up to you).
5.  When you think it is almost done, put some salt for taste and the cut celery sticks into the pot. Stir everything about for a couple of minutes and serve. (I ALWAYS add a few dash of sweet soy sauce before eating)

Usually people eat soup with rice or whatever. I just enjoy the entire huge bowl of soup just like it is :)

p.s. - Had the mutton soup with a friend. And we finished the entire pot in one sitting :)