By Nick Malgieri
The combination of chocolate and hazelnuts probably originated in the Piedmont, where the torta gianduja is a popular dessert. Not very sweet, the torta derives its richness from the chocolate filling.
For the gianduja cake batter, preheat the oven to 350 degrees and set a rack in the middle level. Butter a cake pan that is 10 inches in diameter and 2 inches deep and line the bottom w