Choux Pastry: Preheat your oven to 375 degrees F (190 degrees C) and place the oven rack in the center of the oven. Line a baking sheet with parchment paper or you can lightly butter or spray the pan with a non stick vegetable spray.

In a bowl, sift or whisk the flour.

Put the butter, sugar, salt, water, and milk in a heavy saucepan. Place over medium high heat and bring to a boil. (Make sure that the butter melts before the water boils to reduce the amount of evaporation.) Remove from heat and, with a wooden spoon or heatproof spatula, add the flour, all at once, and stir until combined. Return the saucepan to the heat and, stirring constantly, cook over low heat until the dough comes away from the sides of the pan and forms a thick smooth ball of dough (about one minute). Transfer the dough to your electric stand mixer, fitted with the paddle attachment (or use a hand mixer or wooden spoon), and beat on low speed to release the steam from the dough (about a minute). Once the dough is lukewarm add about 3/4 of the lightly beaten eggs (dough will separate and then come together) and continue to mix, on low speed, until you have a smooth thick paste (dough will fall from a spoon in a non-ragged "V" shape). (See video for demonstration.) Add more beaten egg, if necessary, until you get the correct consistency. Spoon or pipe (or use an ice cream scoop) 8 mounds of dough (a scant 3 tablespoons (40 grams)) onto the baking sheet, spacing about 2 inches (5 cm) apart. With a pastry brush, gently brush the tops and sides of the dough with a lightly beaten egg. 

Bake for 10 minutes and then reduce the oven temperature to 350 degrees F (180 degrees C). Bake for a further 25 to 30 minutes or until the shells are golden brown and when split, are dry inside. Remove from oven and place the baking pan of a wire rack. Cool the choux pastry completely before filling.

Chocolate Ganache: Place the finely chopped chocolate in a medium sized stainless steel (heatproof) bowl. In a small saucepan, heat the cream and butter over medium heat. Bring just to a boil. Immediately pour the boiling cream over the chocolate and allow to stand a few minutes. Then gently stir with a whisk until smooth. (The ganache can be made ahead and stored in the refrigerator for up to a week. Reheat in a heatproof bowl set over a saucepan of simmering water or in the microwave.)

Assemble: Split the pastry shells in half, fill the bottom halves of the shells with a scoop of ice cream, and replace the top. Drizzle each Profiterole liberally with warm Chocolate Ganache. Serve immediately.

Note: Truffles can be made with any leftover Ganache. Truffles are just small balls of chocolate that can be rolled in cocoa powder, powdered sugar, or toasted chopped nuts. Make sure the chocolate ganache is well chilled before forming into balls. You can use your hands to form the truffles, or else a melon baller or small spoon. Truffles can be refrigerated for a couple of weeks or else frozen for a couple of months.

Makes 8 Profiteroles.