James Martin served up a tasty foolproof homemade gravy with yeast extract and sherry vinegar on James Martin’s Saturday Morning.
The ingredients include: sherry, red or white wine, gravy granules, water, Marmite yeast extract, Brovril beef extract, Sherry vinegar and caramelised onions, optional.
See recipes by James in his book titled: Complete Home Comforts: Over 150 delicious comfort-food classics available from Amazon now.