Butter (or coat with no-stick cooking spray) sides and bottoms of 12 4-ounce ramekins, Set aside.
In the top of a double boiler over simmering water, combine semisweet chocolate, bitter chocolate, butter and vanilla.
When butter and chocolate are melted, stir to blend. Set aside.
In large bowl of mixer, combine eggs, egg yolks and brown sugar. Beat on high 5 - 7 minutes, or until thick and quadrupled in volume.
Reduce speed to low.
Add cornstarch, one tablespoon at a time, beating to incorporate after each addition.
Increase speed to high. Beat 5 minutes or until mixture stands in soft peaks.
With a rubber spatula, fold the chocolate into the egg mixture, scraping the bottom and sides of bowl frequently.
Divide batter between prepared ramekins.
Bake in preheated 375°F oven 10 minutes (cake will be light crusted with a soft center).
Remove from oven and cool.
Cover with plastic wrap and refrigerate until ready to serve.
Pour thawed raspberries in blender and puree. Strain and discard seeds. Chill, covered, until ready to serve.
Run a knife blade around edges of cake to separate cake from ramekin. Invert ramekin on serving plate. Lift ramekin, leaving cake in center of plate.
Ladle raspberry coulis around cake and garnish with fresh raspberries, triangular cookie or chocolate piece and mint.