10brown onions sliced thinly to make rings- you can do this in about 3 minutes in a food processor or you can use a mandoline or by hand with a sharp knife and a firm grip.
10tablespoonsof olive oil
2teaspoonssea salt
Instructions
Put all the onion rings in the slow cooker and mix the olive oil through.
Sprinkle the salt on top and give it another stir.
Pop the lid on the slow cooker and turn it to low for 12 hours.