Given the background description of some cooking related query, summarize the question into a title

Let me give you an example: I recently attempted to grill duck legs on my propane Webber. I was afraid of flare-ups due to the high fat content in the duck meat so I grilled with somewhat low and indirect heat. It took a long time, but I got them looking lovely and brown and not burned. The only problem was this: they were tough and didn't taste very good at all. Clearly I did something very wrong. Any advice?
The answer to this example can be: Tips for grilling duck legs?
Here is why: A person gives a detailed description about grilling duck legs and the process they followed for the same. However, at the end the duck legs did not turn out well, so the person wants tips about how to properly grill duck legs. The question is summarized as Tips for grilling duck legs? for easy indexing next time someone searches for a similar query

OK. solve this:
It seems to be a popular ingredient in Asian (esp. Chinese?) food. I encountered them on pork spareribs, and some side dishes. Apparently it turns everything completely black when it is added.I can rule out soy sauce (which is too salty and tastes entirely different) and I realise that this question is rather vague. What additional information could I provide?Edit: I can rule out oyster sauce. I asked in a restaurant what the black stuff was, but either she didn't understand me or she didn't want to (all she told me was that it contained salt). Finally she said she made it herself. Anyway, I bought Hoisin sauce:and I think it's as close as it gets (perhaps the restaurant uses a slightly different version of the one I bought, as mine is a bit saltier and a bit less sweet).Update: I finally discovered the exact sauce I was looking for. It turned out to be Black Bean Garlic Sauce.
Answer:
What is the black, slightly sweet, flavour in some Asian food?