In a large plastic bag, crush the vanilla biscuits into small pieces using a rolling pin. Then coarsely chop the pistachios.
Heat the heavy cream in a saucepan or microwave so that it comes to a simmer (not a boil). You will also need to melt the butter in a saucepan as well. Place the chocolate chips in a large bowl and pour the melted butter and simmered hot heavy cream over the chocolate chips.
Wait a minute or 2 and begin to stir the chocolate using a small whisk. You may need to reheat the chocolate in the microwave a few more times. If so, heat in 20-second intervals. You don't want to overheat the chocolate.
Once the chocolate is a smooth, silky consistency, add the crushed biscuits and chopped pistachios. Stir to combine. Note: it may look like there are way too many biscuits and it won't come together. Just trust the process and keep mixing until everything is well mixed. Once it's wrapped tightly, everything will come together well.
Place a large piece of plastic wrap onto a flat surface and pour the chocolate mixture on top. Use your clean hands or a spatula to form it into a long log shape.
Roll the plastic tightly around the chocolate mixture so that it resembles a stick of salami. You can wrap a second piece of plastic wrap over the chocolate salami if you want to make it more secure. Finish off by twisting both ends as tightly as you can.
Place on a baking sheet and refrigerate for at least 4 hours. Once the time has passed, remove the plastic wrap and coat the chocolate salami in powdered sugar. Slice and enjoy! Store in the fridge in an airtight container. TIP: Let the chocoalte salami come to room temperature for about 30 minutes to make slicing easier. It can be difficult to cut through when it is straight out of the fridge.
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Notes
Best way to store chocolate salamiFRIDGE: Keep the chocolate salami in an airtight container in the refrigerator for up to 2 weeks.FREEZER: Wrap it tightly in plastic wrap. Then you will need to wrap it once more with foil and keep frozen for up to 1 month.