"This quick and easy, rich onion gravy is the best accompaniment to great British foods like toad in the hole or bangers and mash. It freezes well...."
INGREDIENTS
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2 tablespoons oil ( vegetable or cold-pressed rapeseed oil)
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2 tablespoons butter (room-temperature)
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2 medium red onions (peeled and thinly sliced)
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1 teaspoon sugar
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1 teaspoon balsamic vinegar
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3 cups/750 ml beef stock
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4 teaspoons cornstarch
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4 teaspoons cold water
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Salt and black pepper
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Optional: 1 teaspoon ice cold butter