Place oil in a saucepan and heat. Sauté onions over medium heat until they are brown (approx. 5-10 min). Add the flour by sprinkling it over the onions; continue to cook, stirring regularly for 2-3 minutes. Add in the chicken stock and Worcestershire sauce gradually. Allow to cook until thickened (approx. 5 minutes). Cover and allow to cook on low for another 10-15 minutes, stirring every so often.
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