Pulse the cookies in a food processor until they are a fine crumbs. Add the salt.
Coat the bottom of a 10" springform pan with a little bit of the melted butter.
Toss the crumbs with the rest of the butter.
Set aside ½ cup of the crumbs. Press the rest of the crumbs into the bottom of the pan.
Bake for 6 minutes. Set aside to cool.
When cool enough to handle, wrap the pan in two layers of heavy duty aluminium foil.
Make the filling:
In the bowl of your stand mixer, fitted with the paddle attachment, whip the cream cheese on medium speed for 2 to 3 minutes.
Add the sugar, mix for two minutes longer.
Reduce the speed to medium-low and add the eggs one at a time scraping down the sides after a few to make sure all things are combined.
Add the vanilla, liqueur and heavy cream. Increase the speed to medium and mix for 4 more minutes, stopping the machine and scraping the sides halfway through.
Pour the batter into prepared crusts.
Pour the melted chocolate over the top and using a butter knife, swirl about, taking care not to touch the bottom.
Place the springform pan in a large baking dish with high sides. Fill the pan halfway with boiling water, taking care to not spill any water in cheesecake, making a water bath.
Bake for 25 minutes. Without opening the oven, reduce the heat to 225 and bake for 1 hour 45 minutes longer or until the middle is no longer shiny and the cheesecake is firm.
Remove the pan from the oven and water bath. Run a thin knife around the inside edge of the pan. Let cool completely then loosely cover and refrigerate for at least 6 hours.
Make the whipped cream.
Combine the instant coffee with the hot water until dissolved. Whip the heavy cream with the sugar until soft peaks form.
Add the cooled coffee and whip 45 seconds longer – being careful not to beat too dry.
Sprinkle reserved crumbs around the edge of the cake. Serve with the whipped cream!