Lower the oven rack to the lower third position and preheat oven to 325°F. Line a 9×5 inch loaf pan with parchment paper -- leave an overhang on both sides and cut to fit. You'll use this to remove the cheesecake eventually
Mix together the graham crumbs, melted butter and sugar. Press into prepared loaf pan -- use a 1/4 cup measure to firmly press down evenly and seal in the base. Bake the crust for about 23 minutes or until lightly golden brown on the edges
Prepare the filling: In the bowl of a stand mixer fitted with paddle, beat the cream cheese on high speed until smooth. Add in the sugar, vanilla, and lemon juice until completely combined and smooth, about 2 minutes on lower speed. Scrape down the bowl and then with your mixer on low, add your beaten egg and mix just until combined (don't over-whip in air or your cheesecake may deflate)
Pour the batter on top of the cooked crust and smooth the top.
Bake the cheesecake for 45 minutes or until the surface is just set and the middle is still a bit wobbly. If you insert a toothpick it should come out mostly clean
Open the oven door slightly and leave to cool inside or remove from the oven and cool completely in the pan set on a wire rack. Once completely cool, remove the cheesecake (still in pan) to refrigerator for at least several hours and preferably overnight
After chilled, use the parchment to remove from pan. Cut diagonally into 5 pie-shaped slices; or, into small serving squares or logs
Serve with warmed dark chocolate or butterscotch sauce. Fresh fruit is also a great topping