Cherry Topping:
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1 pound   frozen unsweetened cherries, thawed
1/4 cup   kirsch
1/4 cup   (about) Morello cherry syrup or sour cherry syrup

Chocolate Crust:
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8 1/2 oz  chocolate wafer cookies
6 tbls    (3/4 stick) well-chilled butter, cut into 1/2-inch pieces

Chocolate Filling:
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1 1/2 cups  whipping cream
12 ounces   semisweet chocolate, coarsely chopped
16 ounces   cream cheese, room temperature
3/4 cup     sugar
4           eggs, room temperature
1 tsp       vanilla
1 cup       whipping cream, well-chilled (I use heavy whipping cream.)
2 tblsp     sugar
1 tblsp     kirsch
Chocolate curls (optional)
For topping: Soak undrained cherries and kirsch in small bowl 6 hours.

Thoroughly drain cherries in strainer set over medium bowl, shaking
occasionally, at least two hours.  Reserve liquid.

Add enough Morello cherry syrup to cherry liquid to measure 1 cup.  Pour
6 tablespoons into heavy 8-inch skillet (reserve remaining liquid for
filling).  Halve cherries and add to skillet.  Boil until syrup is
thickened and mixture resembles preserves, about 6 minutes.  (Can be
prepared 2 days ahead.  Chill.)

For crust: Generously butter 9-inch springform pan.  Finely crush
cookies in processor, using on/off turns.  Cut in butter until mixture
begins to gather together, using on/off turns.  Press crumbs into bottom
of pan and up sides to 3/4 inch from top; there should be no cracks.
Refrigerate crust for at least 30 minutes.

For filling: Preheat oven to 325 degrees F.  Heat 1 1/2 cups cream with
chocolate in heavy medium saucepan over low heat until chocolate melts,
stirring constantly.  Cool 10 minutes.

Beat cream cheese with 3/4 cup sugar until smooth.  Beat in eggs 1 at a
time until just combined.  Beat in chocolate mixture, then remaining 10
tablespoons cherry liquid and vanilla.  Pour into crust.  Bake until
outer 2 inches of cake are firm but center still moves slightly, about 1
1/4 hours (top may crack).  Cool completely on rack.  Top pan with paper
towels and cover tightly with foil.  Refrigerate 1 to 2 days.

Remove foil, paper towels and pan sides from cake.  Spread cherry
topping over cake.  Beat remaining 1 cup cream with 2 tablespoons sugar
and kirsch to peaks.  Spoon into center of cake.  Top with chocolate
curls if desired.  (Can be prepared 2 hours ahead and refrigerated.) Let
stand at room temperature for 15 minutes before serving.