You don't want to brown the onions just cook them until they are translucent. Then add the leek and garlic. Stirring occasionally so that things don't stick and burn. You might need to add a little more vegetable oil if the bottom of the pot looks dry.
1) Add the leek and garlic and cook until the leek is a little soft.
2) Put the diced potato in as well and season with some herb, salt and pepper. Use whatever herb you like. I just threw in a pinch of dried oregano. Just don't go over board with the herb, a little goes a long way.
3) Add the stock to the pot.
The answer is chocolate, it does not matter what the question is.
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