Preheat oven to 425.Bring the butter, water, and salt to a boil over medium heat in a large saucepan.Once the mixture is boiling, add the flour and stir together with a wooden spoon.Continue to stir vigorously until the mixture forms a dough. Keep stirring the dough over the heat for a couple minutes.Remove the pan from the heat and let the dough cool for a few minutes.When the dough has cooled to being just warm to the touch, vigorously stir in the eggs with the wooden spoon. The dough will become very smooth and creamy in consistency.Stir in the cheese and pimentos until well incorporated.Spoon the dough by the tablespoon onto a parchment or silicone mat lined baking sheet.Bake at 425 for 10 minutes, then reduce the heat to 350 and cook for another 20 minutes, or until the puffs are golden brown.Enjoy!