I have used it to cook, a little in a pan, like a normal oil, but a drizzle with a plain olive oil...used it that way for steak, also for prawns.

Lemon chilli prawns are superquick and delicious.

I have also used chilli seeds toasted up in normal oil as it heats, then tossed in some vegies to give them flavour, you could use chilli oil there too.

If it is clear, as is.

If it has the chilli in it, without the solid bits, as that would be excessively strong...