To keep the candle upright and anchored by gravity to the bottom of the glass, I used a threaded hex nut. The inside diameter of the nut was a little larger than than the candle so I wrapped a strip of aluminum foil around the base of the candle and then threaded the nut onto the candle.
Then I lowered the candle down into the glass and filled glass (with still usable rancid corn oil) up to the top of the wax on the candle but below the wick and then lit the candle.
Since a used jar (most people just throw these away) can be substituted for the glass and the candle can be attached directly to the lid with wax or to some other weight, this lamp costs $0.00 if you use old cooking oil.
Credit where credit is due. Mine is the zero cost version of this one:
See the next step (cooking).
I needed to raise the candle up a little bit so I used some old, used plumbing parts I had out in the garage. Most people just throw these away.
It helps to stir your food every ten minutes or so. It takes about 45 minutes to an hour before lunch reaches its maximum temperature.
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Cooking With Three Candle Flames.