Pear Pie with Streusel Topping

This is Lucas' favorite dessert:

Ingredients
2/3 cup flour; divided
1/2 cup sugar
1/2 tsp cinnamon
1/8 tsp salt
3 T fresh lemon juice
6 medium pears; peeled, cored, and sliced
1/2 pie crust (just bottom)
1/3 cup packed brown sugar
3 T chilled butter

Directions
1. Combine 1/3 cup flour, sugar, cinnamon, and salt to large bowl. Add lemon juice and pears; toss to coat
2. Arrange pears over pie crust
3. Combine remaining flour, brown sugar, and butter in a food processor; mix until mixture resembles coarse crumbs; sprinkle over pears
4. Bake at 375 for 1 hour

Serve warm with ice cream!