Strawberry Rhubarb Galette (with video)

INGREDIENTS

2 cups

quartered strawberries

1 1/2 cups

sliced rhubarb (1/2 inch thick)

1/2 cup

granulated sugar (see notes)

1 tsp

vanilla extract

1 tbsp

lemon zest

2 tbsp

cornstarch

Pie dough (homemade or store-bought) that can be rolled out into a 12-inch circle (about 1/8-inch thick)

1 tbsp

cold unsalted butter, diced

egg mixed with 1 tablespoon water

Demerara sugar for sprinkling (you can also use turbinado sugar)