Cut lemon into small wedges, remove ALL seeds. Grind raisins and lemon wedges together into a bowl. Add sugar. Spread mixture on half of pie crust leaving 1/2 inch border. On border brush water and place other half of pie crust on top, crimping border to seal it. You can brush top with cream or beaten egg for browning. Place several slots to vent steam and bake about 45 min in 350F oven or when dough is browned top and bottom. Cut into 2inch squares. Really good with vanilla ice cream.