Galettes are the best dessert to put together on a whim—they’re (literally) easier than pie! We filled this one with fresh strawberries and rhubarb to celebrate spring. Cardamom and vanilla bring a lightly spiced warmth that pairs perfectly with the sweet and tart fruits.
GLUTEN FREE TIP: Unlike wheat flour crusts, this crust performs best and is most pliable when cool, but not totally chilled. Chill only for the time it takes to make the filling, and then immediately use the dough. Or, if you make it in advance and it’s chilled too firm, remove it from the fridge about 15 minutes before you intend to roll it.
Place flour, sugar, salt and butter into a bowl and, using a pastry cutter, cut the butter in until the size of large peas. Slowly drizzle in ice water, gently incorporating each addition with a fork.
After you add the fourth tablespoon, squeeze the dough together into a few handfuls. If it sticks, continue to form the dough into a disc. (If still too dry, add another tablespoon of water and then proceed to making the disc.) The dough should adhere and not be crumbly, but it also shouldn't be too wet.
Cover and chill the dough while making the filling. See recipe notes.
Mix together rhubarb, strawberries, sugar, tapioca starch, cardamom and vanilla extract. Mixture will appear very dry at first. Allow to macerate for 10 minutes.
Flour your surface and roll the dough into a large circle about 12 inches in diameter. Transfer to a parchment-lined baking sheet before adding fruit.
Mound strawberry rhubarb mixture into the center of the dough, leaving behind excess liquid that has released from the fruit.
Fold the edges of the pie crust towards the center, leaving a small circle of exposed fruit. Lightly whisk the egg together with a splash of water. Brush the egg wash over the crust and sprinkle with coarse sugar.
Bake on parchment lined baking sheet for 45 minutes until crust is firm and golden. Allow to cool for 15 minutes before serving.
