What is a flare grills cooking function?

It seems like you're asking about "flare grills" but there isn't a standard grill type called that. It's possible you're referring to one of these:

* Flare-up: This is a cooking phenomenon on grills, specifically gas grills, where flames shoot up from the grill grates. It's caused by drippings falling onto the hot burner and igniting. While it can add flavor, it also can cause uneven cooking and burning.

* Flare grilling: This is a specific technique where you intentionally create flare-ups to add a smoky flavor to food. This is usually done by adding wood chips or chunks to the grill.

To clarify your question, could you tell me:

* What kind of grill are you talking about? (Gas, charcoal, etc.)

* What are you trying to accomplish with the grill? (Are you looking for a specific type of cooking, like high heat searing or slow smoking?)

Once I have more information, I can give you a more specific answer about the cooking function.