4 sweet potatoes, peeled, cut into ½ inch chips and placed in a bowl of cold water
Corn flour
Vegetable oil
Coarse ground Sea Salt
Remove the chips from the water and pat them dry with some kitchen towels.
Get a medium size chip-frying pan, put about 2 inches of vegetable oil inside and place it over a medium to low heat. When the oil is hot drop your chips in, without overcrowding the pan, and fry for about 8 minutes.
Tip #4: Temperature for your first fry
The first fry is all about cooking the potatoes without colouring so you want the oil to be at a relative low temperature, a low to medium heat will do this. If in doubt use a probe thermometer, you want your oil to be at 235F/112C.
Once the first frying is done remove the potatoes from the pan and place them on paper towel to drain. Change the heat of the oil to medium-high.
At this point you need to sprinkle a generous tablespoon of corn flour on top of the chips and shake them around so they get coated. When the oil is hot drop the chips back in it and fry for 4 minutes or until golden. Remove, drain on kitchen towels and sprinkle with salt.
Tip #5: Temperature for your second fry
The second fry is all about crispiness so you want a nice high temperature that will create that lovely crust around your chips, for this you need the oil to be relatively hot so set your heat to medium to high. If in doubt use a probe thermometer, you want your oil to be at 375F/190C.
This technique will also work well with normal potatoes.