Caramel Apple Pecan Streusel Pie

Homemade Caramel Sauce (or any store-bought variety)

recipe homemade pie crust

medium sliced apples (about 2 and 1/2 pounds) (I used Gala apples)

lemon juice

all-purpose flour

granulated sugar

light brown sugar (packed)

and 1/2 teaspoons ground cinnamon

salt

old-fashioned oats

all-purpose flour

light brown sugar (firmly packed)

unsalted butter (melted)

pecans (chopped)