Chokahlua Cheesecake

Chocolate Crumb Crust
1 1/3 cups chocolate wafer crumbs
1 tablespoon granulated sugar
4 tablespoons unsalted butter (at room temperature)

Combine wafer crumbs, sugar and butter, mixing well. Put mixture in an even layer over bottom of a 9-inch springform pan.

Cheesecake
1 1/2 cups semisweet chocolate pieces
2 tablespoons butter
1/4 cup Kahl