Heat the butter in a soup pan and once melted add the onions and cook stirring occasionally for about an hour till they are all jammy and sweet. Add a little water if they are sticking to the pan.
Add the red wine and thyme and bring to boil to reduce by half, now lower the heat and add the stock a bit at a time stirring well. Season with salt and pepper and simmer for about 15 minutes.
Toast the slices of baguette and add each slice to a heatproof bowl of your onion soup and cover with the grated Gruyère cheese and pop under the grill for a few minutes till all bubbly and melted.
Notes
You can use all beef stock if you prefer but I like the mix of the two types of stock. Some people use white wine, personally I prefer red for my French onion soup.Store the onion soup in the fridge for a few days of freeze for up to 6 months.
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