In coming up with this recipe I borrowed liberally from Bruce Healy and Paul Bugat’s The Art of the Cake. I liked the details they added (especially the finishing sauce) which I’m sure will produce a superior Charlotte. Or at least I’m pretty sure…so don’t try this until I’ve done it, K?
For the jelly roll:
For the filling:
1 recipe mango mousse
For the rum syrup:
1 tablespoon heavy syrup
1 tablespoon light rum
For the glaze:
1 teaspoon unflavored gelatin
2 ounces (1/4 cup) cold water
2 ounces (1/4 cup) strained orange juice
1 3/4 ounces (1/4 cup) sugar
1 recipe crème anglaise spiked with two tablespoons light rum.
Prepare the joconde according to directions, except you’ll be using only half the batter to cover the same size (13″ x 18″) pan. The reason for this? Because you want a tighter roll and that means a thinner joconde sheet. Keep in mind that it’ll bake up in less time, about 8 minutes.
When the sheet has cooled, transfer it to a sheet of waxed paper or parchment. Trim the edges with a serrated knife. You’ll have to judge for yourself if the sheet is flexible enough to roll as it is. If it seems rigid, brush on some of the heavy syrup to give it flexibility.
Cut the joconde in two and apply the marmalade to half of the sheet. Then roll up the marmalade-covered half like a jelly roll, being sure to keep the roll tight. Wrap it in plastic wrap and freeze it. Cut a bottom layer out of the remaining half and keep it in the freezer.
To assemble, slice the piece of frozen jelly roll into 1/4″ to 3/8″ (1 cm) pieces. You should have about 24 of them. Line a domed Charlotte mold (8″ across) or round-bottomed bowl in plastic wrap, then with the slices. Paint the slices with the rum syrup. Insert the mold into the fridge while you prepare the mango mousse.
When you’ve got the mousse ready, spoon it into the mold, apply the joconde bottom along with an 8″ cake circle, and insert the mold into the refrigerator for at least 4 hours, preferably overnight. A few hours before serving, de=pan the Charlotte by turning it upside-down and removing the mold and the plastic.
Now prepare the glaze. Stir the gelatin and cold water together and let the gelatin soften. Warm the orange juice and sugar in a small saucepan until the sugar melts. Add the gelatin mixture and stir until it dissolves. Pour the mixture into a small bowl and insert the bowl into an ice bath. Just as it’s starting to thicken, remove the glaze from the bath and use.
Glazed, the Charlotte can be eaten immediately or held in the fridge for several hours.