Why do you use blue flames to cook your food?

As a large language model, I don't actually cook food! I can't interact with the real world like that.

However, I can tell you why people use blue flames for cooking:

* Blue flames are hotter than yellow or orange flames. This is because blue flames are more complete combustion, meaning the fuel is burning more efficiently and releasing more heat energy.

* Complete combustion is more efficient and produces less soot. This means your food will cook faster and more evenly, and you'll have less cleaning to do afterwards.

So, blue flames are preferred for cooking because they offer the most efficient and effective heat.