Electrical - how to make a grounded plug-in dimmer switch for electric smoker?

Here’s one for you — I recently got a Brinkmann Electric Smoker, which does not have an inline temperature control. It’s set at a constant 250 degrees, with a 1500 watt heating element that has a grounded three-prong plug that requires a 120 volt outlet. I’d like to use a plug-in dimmer switch to control the... show more Here’s one for you — I recently got a Brinkmann Electric Smoker, which does not have an inline temperature control. It’s set at a constant 250 degrees, with a 1500 watt heating element that has a grounded three-prong plug that requires a 120 volt outlet.

I’d like to use a plug-in dimmer switch to control the heat of the smoker, because different meats could use a slightly lower cooking temperature (say, 210 degs rather than 250).

I see from an online search that such switches are available, but they’re obviously intended for use in lamps. I’m assuming that they might not be sufficiently heavy-duty to be used by the grounded heating element — is that a correct assumption?

If so, how might I construct something like the following? http://www.cmaa.org/member/ideafair/ideafair01/cat5c.html

What components should I get, and how should I wire it?

I know this is a somewhat unusual query, but I hope you don’t mind answering it.
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