In a large saucepan over medium heat, melt butter with water, salt and zest of 1 lime. Bring to a simmer and then slowly whisk in flour. Remove from heat and keep whisking until mixture forms a ball and breaks away from the sides of the pan. Slowly add eggs in thirds. Spoon batter into a pastry bag fitted with a large star tip and refrigerate 15 minutes. Meanwhile, fill a large saucepan 2/3 full with vegetable oil and heat to 350 degrees F. Remove batter from refrigerator and slowly squeeze 3-inch long strips of batter into the oil. Fry in batches, until golden brown, 5 to 6 minutes, flipping halfway through. Drain churros on paper towels. In a paper bag, add sugar, cinnamon and remaining zest. Once churros have cooled slightly, in batches, toss churros in bag and shake to coat with cinnamon sugar. Serve warm.
Recipe courtesy Sunny Anderson