Torta di nocciole is the hazelnut cake of the Langhe—a dense, fragrant, flourless (or near-flourless) cake built around the Tonda Gentile delle Langhe hazelnut that captures the essence of Piedmont's autumn in a single, rustic slice. The cake's simplicity is its genius: ground toasted hazelnuts, eggs, sugar, and a minimal amount of flour (some versions use none at all, making it naturally gluten-free) are combined into a batter that bakes into a golden, slightly domed cake with a fine crumb, a rich nuttiness, and an aroma that fills the kitchen. The hazelnuts are toasted until deeply golden, their skins rubbed off, then ground to a meal that retains some texture—not a smooth paste, but a coarse flour with visible hazelnut pieces that provide both flavour and structure. The eggs are separated: yolks beaten with sugar until pale and thick, whites whipped to stiff peaks and folded in for lightness. The ground hazelnuts and a spoonful or two of flour are folded into the yolk mixture, then the whites are incorporated with a gentle hand. Baking at moderate heat produces a cake that is golden-crusted outside and moist, almost fudgy within—the high fat content of the Langhe hazelnuts keeps the crumb rich and prevents any trace of dryness. The torta is served dusted with powdered sugar, sometimes accompanied by a glass of Moscato d'Asti or a dollop of zabaglione. It improves over 24 hours as the hazelnut oils distribute through the crumb. This is the cake of every Langhe nonna, the standard offering at every country trattoria dessert course, and the sweet counterpart to the savoury hazelnut tradition that also produces gianduja chocolate.
Toast Tonda Gentile hazelnuts until deeply golden. Grind to a coarse meal—not a paste. Fold whipped egg whites for lightness. Minimal or no flour. Bake until golden outside, moist inside. Dust with powdered sugar.
Toast nuts in a single layer at 170°C for 12-15 minutes, watching carefully. Rub in a tea towel to remove skins. A tablespoon of rum or hazelnut liqueur (Frangelico) enhances the nut flavour. Serve with zabaglione made with Moscato d'Asti. The cake keeps well for 3-4 days wrapped tightly.
Using raw hazelnuts (must be toasted for flavour). Grinding too fine (becomes oily paste). Over-baking (should remain moist). Using too much flour. Deflating the egg whites during folding. Using generic hazelnuts instead of Tonda Gentile.
Slow Food Foundation; Giovanni Goria, La Cucina del Piemonte