Bring water and butter to a boil in a heavy saucepan. Add flour and salt at once.
Beat until smooth ands forms a ball; remove from heat. Beat in eggs one at a time
until batter is shiny.
Place by tablespoon portions 2 inches apart on ungreased cookie sheet. Bake 25
minutes or until golden brown. Cool.
Slice top off and scoop uncooked batter from inside. Fill with filling and replace
top. Sprinkle with confectioners' sugar and serve.
For filling, cream butter and sugar in mixer, blend in vanilla extract and coffee.
Add eggs one at a time, beating 2 minutes after each addition. Blend in chocolate.
Chill for 1 hour before filling cream puffs.