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Heat oven to 200C/180C fan/gas 6. In a non-stick frying pan, cook the onions in the olive oil with some seasoning for 12-15 mins until golden and soft.
Lay the pastry on a parchment-lined baking sheet. Spread over the cranberry sauce, leaving a small border. Scatter over the onions. Bake for 20-25 mins, sprinkling with cheese halfway through.
Toss the lettuce leaves and pear with the dressing and serve alongside the tart.