Heat oven to 400°F. Line a large baking sheet with parchment.
Stir strawberries, sugar, cornstarch, lemon juice, vanilla, and salt in a bowl. Let sit 10 minutes.
Lightly flour your counter. Unroll dough and gently roll to about 1/8-inch thick.
Cut heart shapes with a 3–4 inch cutter. Reroll scraps and cut more until you have pairs.
Whisk egg with water. Brush a thin ring of egg wash around the edge of half the hearts.
Spoon a heaping tablespoon of strawberry filling in the center of each brushed heart.
Top with remaining hearts. Press to seal, then crimp edges with a fork.
Cut a small slit on top for steam. Brush tops with egg wash and sprinkle with coarse sugar.
Chill assembled pies on the sheet for 10 minutes to help prevent leaks.
Bake 18–22 minutes, until deep golden and bubbling. Cool 10 minutes before serving.
Notes
Swap 2–3 tablespoons of the strawberries with a spoonful of strawberry jam for an extra-jammy center. For a bakery-style finish, drizzle cooled pies with a simple glaze (1/2 cup powdered sugar + 1–2 teaspoons milk). Store leftovers airtight at room temperature for 1 day or refrigerate up to 3 days; rewarm at 325°F for 6–8 minutes. Freeze unbaked pies on a sheet until firm, then bag and bake from frozen, adding 3–5 minutes.This recipe is an original creation inspired by classic Heart-Shaped Strawberry Hand Pies flavors. All ingredient ratios and instructions are independently developed.