Ingredients
Method
Make the Tart Dough
- Whisk flour, sugar, and salt together in a large bowl.
- Cut in cold butter with your fingers or a pastry cutter until the mixture looks like coarse crumbs.
- Mix egg yolk with 2 tbsp ice water, add to the flour, and stir until the dough just comes together. Add more water, 1 tsp at a time, if it's too dry.
- Shape into a disc, wrap in plastic, and chill 30 minutes in the fridge.
Blind Bake the Crust
- Heat the oven to 200 C / 400 F.
- Roll the chilled dough into a 11-inch circle and fit it into a 9-inch tart pan. Prick the base all over with a fork.
- Line with parchment paper and fill with pie weights or dried beans. Bake 15 minutes.
- Remove the weights and parchment, then bake 5 to 8 minutes more until the base is golden and dry to the touch. Cool completely before filling.
Roast the Peaches
- Toss peach halves with honey, melted butter, cinnamon, and a pinch of salt. Arrange cut side up on a sheet pan.
- Roast at 200 C / 400 F for 20 to 22 minutes, until the edges caramelize and the peaches are tender but still hold their shape when lifted with a spatula. Set aside to cool slightly, reserving the pan juices.
Make the Mascarpone Filling
- Whisk mascarpone, heavy cream, powdered sugar, vanilla, and lemon zest together until smooth and it holds soft peaks, about 2 minutes. Stop before it looks stiff or grainy.
Assemble the Tart
- Spread the mascarpone filling evenly into the cooled tart shell.
- Slice the roasted peaches and arrange them over the filling.
- Drizzle with the reserved pan juices and scatter pistachios and thyme on top.
- Slice and serve, or chill 15 minutes for cleaner slices.
Notes
- Use peaches that are ripe but still firm, soft fruit turns to mush when roasted
- Chill dough 30 minutes minimum before rolling for a flakier crust
- Whip mascarpone filling only to soft peaks, never stiff
- Cool the crust fully before adding filling or it will melt and slide
- Assemble the tart within a few hours of serving for the crispest base
