Steps:
- Put the olive oil, onions, and thyme in a large saucepan. Cook over gentle heat for about 15 minutes until the onion is very soft. Stir in the stock, red wine, sugar, and vinegar. Bring just to the boiling point - but do not let it boil. Meanwhile, put the bread under the broiler. Toast 1 side, then put the cheese on the untoasted side and broil until melting. Mix the cornstarch with 1 tablespoon water to form a paste. Slowly add to the soup, stirring all the time, until glossy and thickened. Season with salt and pepper. Serve the soup hot with a cheese crouton floating in each bowl.
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