I've had this conversation with people many times, a consequence is that some of them have no idea what caramelised onions actually are - they think it's the state you get to after 10 mins.
Thinly slice 10 onions, dump them in a big pot with some oil on a medium heat for 10-15 minutes stirring frequently. Then turn the heat down to low and cook for a further 45-60 mins, check on it and stir every 10 mins or so. When it gets dry, add water and use it to deglaze the bottom of the pan to prevent burning. It's finished when the onions are a deep brown colour and their volume has reduced to about 1/6th of what it was to begin with. Store in fridge, enjoy with every meal in the following few days.
Thinly slice 10 onions, dump them in a big pot with some oil on a medium heat for 10-15 minutes stirring frequently. Then turn the heat down to low and cook for a further 45-60 mins, check on it and stir every 10 mins or so. When it gets dry, add water and use it to deglaze the bottom of the pan to prevent burning. It's finished when the onions are a deep brown colour and their volume has reduced to about 1/6th of what it was to begin with. Store in fridge, enjoy with every meal in the following few days.