Crust: Cut shortening into flour with pastry cutter or 2 knives. Add sugar. Press in the bottom of an 8" square pan. Bake 20-25 minutes then cool on wire rack.
Filling: Mix gelatin, sugars, salt, cinnamon, ginger and water in saucepan. Let sit until gelatin softens. Heat over medium heat until gelatin dissolves. Stir in ice cream until melted and well mixed. Pour over crust. Chill overnight.