Special equipment: An electric mixer
For the cream: In an electric mixer whip the mascarpone until smooth. Continue whipping and slowly add the cream in a steady stream. Add the sugar and whip for 3 minutes.
For the figs: In a small pot combine the orange juice, balsamic vinegar, sugar, and zest.
Boil over high heat, stirring to dissolve the sugar. Reduce the heat to medium and simmer for 5 minutes.
Preheat the broiler.
Toss the figs with the glaze and spread, cut side up, in a single layer on a baking sheet.
Cook under the broiler for 6 to 8 minutes, until lightly caramelized. Serve the warm figs with the mascarpone cream and toasted walnuts.