Triple Ice Cream Bombe with Fluffy Chocolate-Nut Sauce

Ingredients

For the crumb shell

• 1 1/2 cups vanilla-wafer crumbs, from about 40 wafers
• 1/4 cup (1/2 stick) butter, melted

For the ice-cream layers

• 1 pint vanilla ice cream, softened
• 1 pint chocolate ice cream, softened
• 1 pint New York cherry ice cream, softened

For the fluffy chocolate-nut sauce

• 1 (6-oz) package semisweet chocolate chips
• 1 cup whipping cream, divided
• 1/2 cup chopped nuts

Method