Bake off your favorite homemade or pre-made pie crust in a 9" pie dish before starting the filling.
Finely chop up the chocolate and set it aside.
Add the eggs and sugar to a medium sized saucepan. Set the mixture over medium heat, and vigourously whisk the mixture until it reaches a temperature of 170℉ / 76℃.
Remove the mixture from the heat, and immediately stir in the chocolate. Stir until the chocolate has all melted and the mixture is cohesive. Set it aside to cool for at least 20 minutes.
In the meantime, remove your espresso heavy whipping cream from the fridge. Set a bowl on a scale (or just use a large measuring cup).
Pour the espresso whipped cream over a sieve into the bowl or measuring cup. The espresso beans will have absorbed some of the cream, so add in more heavy whipping cream until you are back at 225g / 1 c.
Beat the heavy whipping cream with a hand or stand mixer until it reaches stiff peaks. Set it aside in the fridge.
Add the butter and salt to a medium sized mixing bowl. With a hand or stand mixer, beat the butter and salt for 3-4 minutes, until it's light and fluffy.
With the mixer running, start adding in big dollops of the chocolate egg mixture, mixing until combined before adding in the next. Once all of the chocolate has been incorporated, beat the mixture for an additional 2-3 minutes, until light and fluffy.
Add in the whipped cream and very gently fold it into the chocolate mixture.
Pour ½ of the chocolate pie filling over your baked pie crust. Scatter the fresh raspberries over the pie filling, then pour the remaining chocolate pie filling over the raspberries.
Cover the pie with plastic wrap and set it in the fridge for at least 4 hours, or until the filling is firm.