1. If you're using a residential 120 VAC deep fryer, chances are it isn't really getting hot enough to do anything. A crappy Rival deep fryer that I bought new, by using a candy thermometer, wasn't getting any hotter than 210 F when set at 350 F. And setting it at 375, waiting 20 minutes for the green light to come on to "tell me its at temperature", a quick look at the candy thermometer showed the actual temperature was 235F.
So I experienced exactly what you're describing. Some crispiness of the deep fried whatever, and most of the coating burning on the bottom of the oil container.
2. So I got out a big heavy (really heavy) pot, and poured in the oil, and brought it up to 350 per the candy thermometer and then went through a series of learning experiences, how to manage the gas valve control on my gas cooktop to keep the temp hovering around 350.
3. For french fries, I did 'em first at 350. Let them cool (and drain) to room temperature, and then re-heated the oil to 375. Best fries I ever had.
PS: Rival was certainly gracious about replacing the defective deep fryer. There were only two hitches: a) the cost of transportation was mine and cost more than the unit new at Home Depot, b) on the internet I found about 27 pages of people complaining about their Rival deep fryers and they all weren't coming up to temperature.
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