Torta di Castagne

Antica Osteria Luchin, in the Ligurian seaside town of Chiavari, has been serving simple food since 1907. It is famous for its farinata—a flat chickpea flour pancake of sorts that is baked in a wide, shallow cast-iron or copper pan. But those in the know never leave without enjoying a slice of Luchin’s torta di castagne. It is the plainest of cakes, mad…