Steakhouse No. 316 in Boulder presents a moody, elegant dining room of dark hardwoods and red velvet banquettes, pairing a focus on prime steaks from its butcher shop with daily-flown seafood such as king crab, oysters and jumbo shrimp. Standout elements include a flaming mezcal cocktail, tableside Caesar, top-cut rib‑eye with Maine lobster and a black truffle butter accompaniment.