A rustic rhubarb pie with a buttery, flaky crust, a bright sweet-tart rhubarb filling, and a crunchy almond and turbinado sugar topping. Simple, elegant, and perfect for spring and early summer.
Mix together flour, sugar and salt in a large bowl. Use a cheese slicer, if you have one, to slice the butter thinly – if not, you can simply dice the butter with a knife.
Add the sliced or diced butter to the dry ingredients, and using your fingers or a pastry cutter, cut in the butter until dough is crumbly but there are still some small visible pieces of butter.
Drizzle with ice water, 1 tbsp at a time, and mix gently with a fork until dough just comes together, do not knead the dough.
Form the dough into a ball and place it on a piece of plastic wrap.
Flatten into a disc, wrap in the plastic wrap and place in fridge for at least one hour but preferably overnight.
The Assembly and Baking:
Let the dough rest for a few minutes at room temperature.
Roll out the dough into a large circle about 1/8–1/4 inch (3–5 mm) thick on a lightly floured surface. Make sure to roll and turn the dough so it doesn’t stick.
Using the rolling pin, transfer the dough to a baking sheet lined with parchment paper.
Slice the rhubarb into batons and place them in a bowl. Toss with the lemon zest, lemon juice, granulated sugar, and cornstarch.
Arrange the rhubarb batons in a decorative pattern on top of the dough, leaving a border around the edges. Fold the dough over the fruit and press gently to seal.
Beat the egg with a pinch of salt and brush it over the exposed pastry. Sprinkle the crust with the flaked almonds and turbinado sugar.
Transfer the galette to the freezer for 15 minutes. Meanwhile, preheat the oven to 200°C (392°F).
Bake for 15–20 minutes, or until the crust is golden brown. Enjoy!