Drain crushed pineapple and cook with butter, brown sugar, cinnamon, nutmeg, and cornstarch until thick; add lime juice and cool completely.
Combine flour, sugar, salt, and butter; mix in egg, water, and vanilla to form dough. Chill for 30 minutes.
Roll dough into 5-inch circles; add 2 tablespoon filling; fold, seal, and crimp edges with fork.
Brush with egg wash, sprinkle sugar, and cut slits on top.
Bake at 375°F for 22–25 minutes until golden; cool on rack before serving.
Optional: Add cream cheese, coconut, or caramel drizzle for variations.
Store in airtight container up to 4 days or freeze for 3 months.