Ingredients
Method
1.
Heat oil in a large saucepan over a medium heat. Add onion and cook for 10 minutes or until very soft.
2.
Stir in butter, garlic, thyme, port, vinegar and sugar, then cook, stirring occasionally, for 10 minutes or until liquid has almost absorbed and is a deep rich brown. Stir in flour, then add stock. Bring to the boil and cook, stirring occasionally, for 10 minutes. Season and serve.
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