Preheat oven to 450*. In small pan, boil water, add margarine and stir until melted. Add flour and salt all at once, stirring until mixed. Cool for 1 minute, then add eggs one at a time. On a greased cookie sheet, drop about 2" apart. Bake for 10 minutes at 450*, then 15-20 minutes at 400*. Let cool. Make a slit in the side and fill with whipped cream.