Slice strawberries and mix with the sugar.  Let stand until sugar dissolves.  Sprinkle gelatin over cold water.  Set stand 5 minutes, then heat gently until gelatin dissolves completely.  Add gelatin and lemon juice to sliced berries.  Fold in whipped cream.  Pour into a 1 quart mold or serving dish.  Chill until set.  Carefully unmold and serve.