I've just made a vast pot of this! It is delicious but has taken the best part of the morning so I wondered if a soup maker could make this as well as I have?
I don't suppose it would manage the gruyere toasts either!
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I think the idea of adding a little sugar is to start the process. I prefer patience but I am now not able to eat onions at all - because of the natural sugar which seems very, very unfair! 
