My buddy's dad makes a KILLER Malaysian/Cambodian/Laotian(?) hot sauce. I would buy it off him if I could.
I asked him for the recipe, and he said its simply chopped peppers, chopped garlic, and pan fry it in cooking oil (or chilli oil, if you have that).
The magic is all in the amount of each ingredient, so I guess it's up to your own experimenting.
The stuff he makes ends up looking similar to this chilli oil stuff you see at pho restaurants, but tastes exponentially better.