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Preheat the oven to 375F and line a baking sheet with parchment paper or silicon mat (I prefer parchment paper)
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Wash berries thoroughly and pat dry to remove excess water. Add fruits, jam, flour, sugar, vanilla extract and lemon juice to a mixing bowl and stir to combine well.
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Take the pie crust from the package, and unroll it on a baking sheet lined with parchment paper (or a silicon mat)
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Transfer the filling to the center of the pie crust. Make sure to leave about 2″ along the circumference (this is where you’ll fold the galette) – 2″ is roughly the space up to the second joint of your index finger!
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Fold the crust over the fruit, pleating every couple of inches (see post for visual instructions)
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Whisk an egg in a bowl, and brush the folded crust with this eggwash – then sprinkle the coarse sugar on top of the crust
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Bake the galette in the oven for about 30 minutes (up to 40 minutes depending on your oven) – start checking at the 20 minute mark, and watch for the fruit bubbling, and a golden brown crust. If you prefer to test using a fork, the crust should crackle under the fork.
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Serve with some flaky sea salt on the crust, and a nice big dollop of ice cream (optional)