- Combine all ingredients for marinade in large heavyweight plastic bag. Seal and marinate for several hours or overnight, rotating often.
- Prepare grill. Let meat come to room temperature in marinade. Remove and grill to desired taste (preferably rare-medium rare) basting often with marinade. Let rest for 10-15 minutes before slicing diagonally into thin slices. (8-12 servings)
- Combine all ingredients in processor or bender and mix thoroughly. Pour into jar with tight-fitting lid. Refrigerate until ready to serve. Shake well before using.
Crust:
- Crust: Position rack in center of oven and preheat to 350 degrees. Mix crumbs and sugar in medium bowl. Add melted butter; stir until mixture is evenly moistened. Press onto bottom of 9-inch springform pan with 2 3/4 inch high sides. Bake until set, about 12 minutes. Remove from oven; cool. Reduce oven temperature to 325 degrees.
- Filling: Stir chocolate into top of double boiler set over barely simmering water until smooth. Remove from over water and cool to lukewarm, stirring occasionally. Combine cream cheese, sugar, and salt in processor and blend until smooth. With motor running, add whipping cream through feed tube and process just until blended. With motor running, add melted chocolate, then add eggs 1 at a time, blending and scraping down sides after each addition until mixture is smooth. Pour batter over crust in pan.
- Topping: Whisk sugar, egg whites, 3 Tbsp. water, cream of tartar, and 1/8 tsp. salt to blend in large metal bowl. Set bowl over saucepan of simmering water, whisk constantly until sugar dissolves and mixture thickens and is hot to touch, about 3 minutes. Remove bowl from over water and stir in marshmallows (keep water simmering in saucepan). Let stand until marshmallows soften, about 3 minutes. Set bowl with mixture over simmering water; using handheld electric mixer, beat until stiff shiny peaks form, about 4 minutes. Beat in vanilla. Scrape topping onto cheesecake. Using metal spatula, spread topping to edges of cake, swirling decoratively. Let stand until set, about 15 minutes.
- Preheat broiler; place cake at least 4 inches from heat source and broil just until topping is lightly browned in spots, watching closely to avoid burning, about 2 minutes. (Or using kitchen torch, lightly brown topping in spots). Chill cake until cold. (Can make 1 day ahead. Cover with cake dome and keep chilled).
- Remove pan sides. Place cake on platter.
- Combine berries in bowl. Cut cake into wedges. Serve berry mixture alongside.