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- Regular
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While oven is preheating, coat a 9-inch springform pan with remaining 1 tablespoon butter. Gently pat roasted tomatoes using a paper towel to remove extra moisture; arrange tomatoes, cut sides up, in an even layer in prepared springform pan until all tomato halves are used. Pat onion mixture dry using a paper towel; place onion slices over tomatoes. Top with grated Parmesan cheese. Unfold puff pastry sheet onto a lightly floured work surface. Gently roll into a 10-inch square, and cut into a 10-inch round. Carefully center and place round pastry over onion slices, tucking in edges. Prick pastry using the tines of a fork in a handful of spots.
Bake at 425°F until crust is golden brown, 25 to 30 minutes. Transfer springform pan to a wire rack; let cool for 5 minutes. Run a sharp knife around edges to loosen; remove springform pan ring from pan. Center a plate over pastry crust; carefully invert tarte tatin onto plate. Garnish with additional Parmesan and thyme. Slice and serve immediately.