Make your dough by pulsing flour, cold butter cubes, sugar, salt, and vanilla in a food processor until the mixture resembles coarse breadcrumbs. This texture matters because uneven butter distribution causes tough spots. Add ice water one tablespoon at a time until dough just comes together—I always feel nervous at this stage that I've added too much liquid, but trust the process. Wrap in plastic and refrigerate for 20 minutes minimum.
While dough chills, combine sliced strawberries, chopped basil, honey, lemon juice, and ricotta in a medium bowl. Gently fold until everything is coated but strawberries stay mostly intact. The basil-honey combination is where the magic happens because the honey's warmth will coax basil oils to the surface during baking. Taste and adjust lemon if your strawberries are exceptionally sweet.
Preheat your oven to 375°F and line a baking sheet with parchment paper. Roll chilled dough on a floured surface into a rough 12-inch circle. Don't stress about perfect geometry—rustic galettes taste better when they look a little imperfect.
Transfer dough to prepared baking sheet and spoon strawberry-basil filling into the center, leaving a 2-inch border all around. I leave mine slightly off-center because it photographs better that way. Fold edges up over the filling in overlapping pleats, which creates those gorgeous rustic folds everyone loves in their cozy summer pastry photos.
Brush folded edges with beaten egg and sprinkle with extra granulated sugar—this creates a caramelized crunch that contrasts beautifully with the jammy filling. Bake for 35-40 minutes until the pastry edges are deep golden brown and the filling bubbles slightly at the center.
Let cool on the baking sheet for 10 minutes before transferring to a wire rack. This resting time is crucial because it allows the filling to set enough to hold together when you slice. Dust with powdered sugar just before serving for that bakery-fresh finish.