Preheat oven to 450 degrees F (230 degrees C). Grease a cookie sheet.
In a medium saucepan, combine 1/2 cup butter and 1 cup water. Bring to a boil, stirring until butter melts completely. Reduce heat to low, and add flour and salt. Stir vigorously until mixture leaves the sides of the pan and begins to form a stiff ball. Remove from heat. Add eggs, one at a time, beating well to incorporate completely after each addition. With a spoon or a pastry bag fitted with a No. 10, or larger, tip, spoon or pipe dough onto cookie sheet in 1 1/2 x 4 inch strips.