Sift together sugar, flour, cinnamon, nutmeg, and salt. Set aside.
Peel and core the apples, then cut into chunks about 1/4" thick. Toss with half the lemon juice about halfway through your apples to prevent browning, and add the rest of the lemon juice when all of the apples are peeled. Add almond extract and stir to combine.
Combine apples with dry mixture and mix to coat. Pour apple mixture into prepared pie crust. Top with crumb topping, making sure to get topping evenly spread all the way out to the edges.
Bake at 400° for 40 minutes. Remove pie from oven and cover the edges with aluminum foil to prevent burning. Return to the oven for another 10-15 minutes. Pie is ready when a knife inserted into the center cuts easily through the cooked apples.
Allow to cool. Serve with vanilla ice cream or whipped topping.