Salted Caramel Apple Galette

large apples, peeled and sliced into 1/4 inch slices (about 4-5 cups slices)2

packed light or dark brown sugar

and 1/2 Tablespoons (12g) all-purpose flour

teaspoons fresh lemon juice (to prevent apple browning)

cinnamon

nutmeg

salted caramel sauce

egg wash: 1 large egg beaten with 1 Tablespoon milk

optional: 1/3 cup (40g) Diamond of California chopped walnuts