Creating the perfect choux pastry is fundamental to the success of raspberry cream puffs. The process begins by bringing water, butter, and salt to a rapid boil in a saucepan. Once boiling, you should add the flour all at once and stir vigorously until the mixture pulls away from the sides of the pan and forms a cohesive ball. This technique ensures that the flour is fully cooked and helps create the right texture. After this, it’s crucial to let the dough cool slightly before incorporating the eggs, one at a time, mixing continuously until the choux pastry is smooth and glossy. This stage is vital as it activates the gluten in the flour, which contributes to the puffs rising beautifully in the oven. Finally, make sure to pipe the dough carefully with a star nozzle to create that elegant, airy shape, and remember not to open the oven door while baking, as this can cause the puffs to collapse.