Why is an electric deep-fat-fryer unsuitable?

When deep-frying, you sometimes have to adjust the temperature quickly. The conventional pan-on-a-flame method gives you reasonable flexibility, but with an electric deep-fat-fryer there is too long a lag between the time you reset the thermostat and the time the oil reaches the desired temperature. Deep-frying with a pan on an electric range causes almost as much trouble as the electric pan method.

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