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Heat oven to 190C/170C fan/gas 5. Slice the tops off the garlic bulbs and sit on a sheet of foil. Drizzle over 1 tbsp of the oil, season and wrap into a parcel. Roast for 50 mins or until soft, then leave to cool – this can be done the day before.
Use a sharp knife to cut the pastry into quarters. Roll out each piece and cut into a 14cm-diameter circle. Use a saucer as a guide if you don’t have a cutter. Pop the circles on a baking tray and score a 1cm border around the edge of each, being careful not to cut all the way through. Avoiding the border, prick the pastry all over with a fork, then chill.
Increase oven to 200C/180 fan/gas 6. When the garlic is cool enough to handle, squeeze the flesh from the bulbs into a bowl. Add the mustard, remaining oil and some seasoning, and use a fork to mash to a paste. Spread this over the pastry, leaving the border clear, then top with the tomato halves, skin-side down, and season well.
Brush the edges of the pastry with egg, crumble over the goat’s cheese and bake for 25-30 mins until the pastry is golden and crisp, and the tomatoes are starting to shrivel. Remove from the tray and allow to cool to room temperature. Scatter over the basil before serving.