December is peak truffle season, so chefs are highlighting the “black diamonds” in decadent dishes.

Truffle Risotto

1. AGED PARMESAN RISOTTO
The supremely creamy rice dish at RPM Italian is finished off with a flurry of truffles, which are shaved on top at the table as guests “ooh” and “aah.” $35 half, $63 full, 650 K St. NW, 202.204.4480