Look for the heart-shaped cake ring at cake and candy supply stores, or call Jane's Cakes and Chocolates at 800-262-7630. You can also use a buttered and floured 8-inch round cake pan with 2-inch-high sides.
Servings: Makes 4 servings.
1/3 cup all purpose flour
Mousse, Cake Assembly, and Glaze
4 ounces bittersweet (not unsweetened) or semisweet chocolate, finely chopped
1/2 cup heavy whipping cream
Bake cake until tester inserted into center comes out clean, about 20 minutes. Transfer cake with foil to rack; cool completely. (Can be made 1 day ahead. Cover and store at room temperature.)
Strain cinnamon cream into large bowl; beat until soft peaks form. Stir finely chopped chocolate in heavy small saucepan over low heat until smooth. Quickly fold warm chocolate into whipped cream (chocolate must be warm to blend smoothly). Immediately drop mousse by dollops over bottom cake layer; spread to within 3/4 inch of edge. Gently press second layer, jam side down, atop mousse. Smooth sides of cake with offset spatula. Chill assembled cake on rack while preparing glaze.
Bring cream, 1/4 cup water, corn syrup, and tea to boil in small saucepan, stirring constantly. Remove from heat; steep 5 minutes. Strain into another small saucepan; return to boil.
Remove from heat. Add coarsely chopped chocolate; whisk until smooth. Cool glaze until thickened, but still pourable, about 30 minutes. Place rack with cake over baking sheet. Slowly pour glaze over cake to cover, using spatula if necessary to spread evenly. Chill until glaze is firm, at least 2 hours and up to 1 day. Place cake on platter and serve.