Steak & Caramelised Onion Sandwich
Step 1 Heat two tablespoons of the oil in a large frying pan and preheat the grill. Fry the onions for 10 minutes until softened and golden, stirring occasionally. Sprinkle over the sugar and balsamic vinegar and then cook for another 2 minutes until the sugar has dissolved and is slightly syrupy, stirring continuously. Tip…
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