Steak is useful for exercising incisors, muffling trumpets, and reducing swelling from black eyes caused by trying to eat steak with one's eye. Put steak to its prototypical use with today's Groupon: for $20, you get $40 worth of steak-house fare at Opus Prime Steakhouse. This Groupon is good for dine-in service only and is not valid for the Opus at Five wine-tasting series on Tuesdays. Reservations are required.

Opus supplies stomachs with refined surf 'n' turf selections, satisfying everyone from steakaholics to herbivores. USDA Prime cuts and fresh fish adorn the menu in a mélange of terrestrial diversity not unlike the original Power Rangers lineup. Prep palates with appetizers such as the Kobe beef sampler, in which a 2-ounce canvas of Kobe beef tenderloin fillet is embellished with braised endives and truffle vinaigrette ($25). Move on to larger-portioned pastures with black Angus steaks in an array of sizes, from the 8-ounce petite filet mignon ($32) to the 22-ounce bone-in cowboy rib eye ($40). Vegetarians delight in the portobello, in which a selection of grilled vegetables and signature garlic mashed potatoes seek shelter beneath the roof of a marinated portobello-mushroom cap topped with blue cheese ($19). Appease an aquatic appetite with a sea change of Atlantic salmon with beurre blanc ($27) or giant butterflied shrimp, lightly breaded, fried, and served with remoulade and traditional cocktail sauce ($24). Sweeping selections of salads and desserts tempt those of comprehensive nutritional proclivity and compartmental stomachs.

Exposed-brick walls and a marble bar enhance Opus's sleek décor and upscale atmosphere. Guests gather in high-backed booths that provide comfort and facilitate privacy for intimate conversation and steak-shaped tattoo comparisons. Full bellies can migrate to the cigar lounge to choose from imported and domestic cigars and unwind in oversize leather furniture.