You'll absolutely love my Gluten Free French Fried Onions, they are so easy to make and much healthier than the ready made kind, with paleo and Whole30 options.
Slice onions on the thinnest setting on your mandoline.
Heat oil on a medium heat. To test that it has heated thoroughly, drop a tiny bit of the arrowroot and see if it sizzles.
Dredge the onions in the corn starch to lightly dust. You should use tapioca starch or arrowroot for Paleo or Whole30.
Drop small amounts of the starch coated onion into oil and cook for 4 minutes, turning once after 2 minutes. Do not crowd the pan or the onions will stick together and not brown properly.
When the onion starts to brown around the edges it's time to remove it, do not wait until it's really brown or you will have overcooked it.
Remove the onions from oil and place on paper towel to cool. Sprinkle with salt if needed.