Preheat the oven to 325F/165C and line a 9-inch spring-form cake pan with parchment paper.
In a mixing bowl, combine the finely ground nuts, sugar, and melted butter, using a fork.
Press the mixture onto the bottom of a 9-inch spring-form cake pan, and scatter the roughly chopped walnuts around the base.
Bake the base in the preheated oven for 10 minutes.
Next, in a mixing bowl, combine the cream cheese, sugar, and flour. Mix using an electric mixer at a medium speed, until fully blended.
Add the eggs one at a time, mixing each one in well, then add the sour cream. Mix thoroughly until fully combined.
In a small mixing bowl, dissolve the coffee granules and the cinnamon in the boiling water, and allow to fully cool. When cooled, gradually add to cream cheese mixture, and mix until well blended.
Pour the mixture over the baked crust. Bake at 450F/230C for 10 minutes.
Reduce the oven temperature to 250F/120C and bake for a further 1 hour.
Loosen the cake from the rim of the pan, and allow it to cool before removing it.
When chilled, garnish with a scattering of nuts, chocolate shavings, or whipped cream.