Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How can you control the highly varying temperatures when smoking food using a kettle BBQ?
You can use foil-wrapped pavers to act as a heat "battery" by heating them for two hours before the smoking starts at 200-250° F.
Use a thermometer and adjust vents accordingly.