[ The uneven slices don't matter too much for onion, it'll all cook down fairly evenly. John moves a bowl over for the onion to go into once the slicing is done. ]

We'll start cooking the onions before doing the rest of the preparation work. Onions have natural sugars that will caramelize if we cook them long enough.

[ He moves to the nearby stove that has a large pot already on it. ]

Turn the burner on to medium and wait for the butter and oil to get hot before adding the onions.