01 -
Take 1 sheet of flaky pastry out and let it sit for 15-20 mins until you can unfold it without it breaking.
02 -
Get your oven hot at 200°C (400°F). Put parchment on a big baking tray.
03 -
Grab a small bowl and mix the egg with water until they're totally blended.
04 -
Dump your sliced peaches in a big bowl. Sprinkle with sugar, salt, cinnamon, and cornstarch, then toss everything so each peach slice gets coated.
05 -
Carefully open up the pastry on your lined tray. If it tears, just press the broken bits together with slightly damp fingers.
06 -
Put peach slices in 3 neat lines on the pastry, but leave about 2.5 cm (1 inch) empty around the edges. Scatter blueberries on top of the peaches.
07 -
Use your brush to put egg wash on the empty pastry borders.
08 -
Pop it in the oven for 16-18 mins, turning once halfway, until the edges puff up golden brown and the fruit gets soft.
09 -
While it's cooking, mix powdered sugar, vanilla, and cream in a small bowl. Stir until smooth, adding drops of extra cream if it's too thick.
10 -
Pour the sweet glaze over your warm tart before serving. Maybe add a scoop of vanilla ice cream on the side.