This tart is a stunning mosaic of red, orange and yellow tomatoes so shiny and candied that the tart really looks like dessert. But it's safely on the savory side thanks to a splash of vinegar and a sprinkling of briny olives.
04Sprinkle olives over caramel. Scatter tomatoes over olives, then sprinkle onions on. Season with thyme leaves, salt and pepper. Top with puff pastry round, tucking edges into pan. Cut several long vents in top of pastry.
05Bake tart until crust is puffed and golden, about 30 minutes. Let stand for 5 minutes, then run a knife around pastry to loosen it from pan, and flip tart out onto a serving platter. Cut into wedges and serve immediately.