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STEP 1
Pre-heat the oven to 220°C, 435°F, Gas Mark 7. Melt half the butter in a saucepan over a medium heat. Add the onions and cook for 25-30 minutes until soft and golden. Stir in the sugar, balsamic vinegar, Thyme and Garlic Granules. Leave to cool.
STEP 2
Melt the remaining butter. Unroll the pastry sheets and cut each one into four. In a patty tin, layer two quarters on top of each other, brushing lightly with butter between the sheets and on top. Spoon 1/4 of the onions into the centre and set aside.
STEP 3
Repeat with the remaining pastry and onions to make 4 tarts. Place a slice of cheese on top of the onions on each tart. Lightly brush the edges of the pastry with butter.
STEP 4
Chill for 30 minutes. Bake for 15-20 minutes, until the pastry is golden and the cheese is melting. Serve with a few rocket leaves.
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