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Deglaze the pan with the wine, allow to reduce by half, then add in the beer and allow to reduce by half again. Add in the stock and bring to the boil, skimming off any scum that rises to the surface. Add the herbs and allow to simmer for 10 minutes, or until the glaze has reduced down to a thick sticky consistency. Pass through a fine sieve lined with muslin cloth 6 times, using a fresh cloth each time. Lightly season with salt and beer vinegar