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1
1.
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2
Thaw the puff pastry sheet (this typically takes 30-40 minutes) and preheat the oven to 400F.
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3
2.
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4
Place the two thawed sheets of puff pastry on a baking sheet, overlapping them slightly in the middle, and crimp the edges so that they stand up slightly and you have a rim around the edges.
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5
Sprinkle the breadcrumbs evenly over the pastry.
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3.
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Cut the onion in half lengthwise and slice it into very thin half-moons.
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8
Distribute the onion slices evenly over the puff pastry.
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4.
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Tear up the mozzarella and put half of it on top of the layer of onions (were saving the other half to top the tart off after it bakes).
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11
5.
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Cut each tomato into 4 thick slices, and put the slices on top of the onions and cheese in rows, fitting the slices closely together.
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6.
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14
Sprinkle most of the thyme over the tomatoes (reserving some) along with a generous amount of salt and pepper.
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15
Sprinkle a little sugar on top as well, and finish it off with a little olive oil poured across the tart in a very thin stream.
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7.
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Put the tart in the oven and bake for 30-40 minutes, until the edges are puffed up and the tomatoes are roasted.
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8.
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19
Finish the tart off with the rest of the mozzarella and thyme sprinkled on top.
