A pancake maker that became meat

I mistakenly prepared, in a pancake maker that had been pareve, patties with meat sauce (a meat dish). Is it possible to kasher the appliance so that it will be permitted lechatchila to make pancakes in it in order to fill them with cheese, for Ashkenazim? The appliance is coated with Teflon, and usually it is used with very little oil, but for preparing the meat patties a substantial amount of oil was used, like regular frying.

Shalom u’vracha 

In principle, it is possible to perform hagalah (kashering by boiling) on a utensil in which food was fried in oil. 

The problem is that appliances of this type are coated with Teflon, and Teflon cannot be kashered by hagalah. 

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