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Instructions
In a heavy based pan over a medium heat, add the vegetable oil and let it warm. Tip in the shallot, carrot, celery and leek. Stir occasionally for about 5 minutes until the vegetables turn dark brown.
Add the herbs and garlic, give it a stir. Add the red wine, port and vinegar. Bubbling hard until reduced to just covering the bottom of the pan.
Add the stock, bring back to the boil and turn down to a simmer until reduced by half
Pass the sauce through a sieve into a clean pan. Then taste and adjust seasoning and set aside until service. When ready to serve, gently warm and whisk in the butter