Boil water, butter, sugar, and salt together in a saucepan. Add flour and work it in until it is all incorporated and dough forms a ball. Transfer mixture to the bowl of a standing mixer and let cool for 3 to 4 minutes. With mixer lowest speed, add eggs, 1 at a time, making sure the first egg is completely incorporated before continuing. Once all eggs have been added and mixture is smooth, put dough in a piping bag fitted with a number 12 tip. Heat about 1 1/2 inches of oil in a heavy pan. Pipe dough into oil, making a free-form lattice pattern; cook until browned, flipping once. Remove cake from oil, drain on paper towels, and top with powdered sugar. Continue until all of the batter is used.
Recipe courtesy of Alton Brown