Step #2 Line an 8-inch cake pan with parchment paper, & spray with nonstick cooking spray.
Step #3 mix 3 tbsps sugar & yolks in the bowl of an electric mixer, until pale yellow & thick, on medium speed, & whisk, about 15 mins.
Step #4 Add vanilla, & fold in melted chocolate just to mix.
Step #5 mix the egg whites & pinch of salt in a bowl of electric mixer; whip on medium speed until frothy.
Step #6 Add 3 tbsps sugar; beat until stiff.
Step #7 Fold the egg whites into the chocolate mixture.
Step #8 Carefully pour batter out onto prepared cake pan.
Step #9 bake this until cake is set & top is dull, about 20 mins.
Step #10 remove this from oven, & let cool on a wire rack.
Step #11 Spray a 5-c-capacity metal bowl with cooking spray; line with plastic.
Step #12 Pack base of bowl with pistachio ice cream; layer cherry ice cream over pistachio.
Step #13 Pack firmly, cover surface with plastic wrap, & place this in freezer.
Step #14 Freeze until the ice cream is very hard, at least 2 hrs or up to 24 hrs in advance.
Step #15 Place cake on baking sheet.
Step #16 Remove ice cream from the freezer, & invert bowl over cake.
Step #17 Keep the ice cream covered with plastic wrap, & return to freezer.
Step #18 Heat oven to 425F degrees.
Step #19 Fill pastry bag fitted with Ateco #5 star tip with meringue; pipe out onto ice cream in a decorative fashion, or spoon meringue over ice cream, & smooth with a rubber spatula.
Step #20 If ice cream starts to soften, return to freezer for 15 mins.
Step #21 place this in oven, & bake this until meringue just starts to brown, about 4 to 6 mins.
Step #22 remove this from oven, & serve as soon as possible.
Step #23 SWISS MERINGUE: Fill a medium saucepan one-quarter full with water.
Step #24 Set the saucepan over med-heat/flame, & bring water to a simmer.
Step #25 mix egg whites, sugar, & cream of tartar in the heatproof bowl of an electric mixer, & place over a saucepan.
Step #26 Whisk constantly until sugar is dissolved & whites are warm to the touch, 3 to 3 1/2 mins.
Step #27 Test by rubbing between your fingers.
Step #28 Transfer bowl to electric mixer, & whip, slowly increasing to high until stiff, starting on lowish speed, glossy peaks form, about 10 mins.