"Inspired by the nostalgia of the finest Argentine cuisine," goes the tag line for one of downtown Miami's newest hot spots, PM Fish & Steak House. No trumpets heralded the arrival of this modern steak-and-seafood house, but word of mouth and social networking led to enormous popularity from day one. The PM stands for Puerto Madero, the name of a port district of Buenos Aires, and for PM Restaurants, a group with a modest portfolio of venues from Mexico to Miami. The food might be inspired by nostalgia, but the décor is a decidedly contemporary mix of brick, dark hardwood floors, and urban industrial accents. Yet what makes PM special isn't just the pretty room and boisterous Brickell crowd; it's the consistently well-prepared cuisine — Argentine and otherwise. Starters ($4 to $12) include seared chorizo sausage; grilled provoleta cheese; crisp turnovers stuffed with spiced meat, fresh tuna, or black cod; and a shrimp/octopus stew with potatoes and olives that is so divine it will make you literally cry for Argentina. The prime steaks come in American cuts — tenderloin, New York strip, rib eye — but are assertively seasoned and grilled with the requisite gaucho spirit. There are no hash browns or French fries, but rather the PM specialty of souffléed potatoes — those classic French-style, crisp, air-filled spud pillows that are rare in these parts. We haven't mentioned the array of raw bar items (including oysters on the half-shell and a live, giant chocolata clam!), the carpaccio (including "veal carpaccio alla Parmesan"), the tartare (tuna, salmon, striped bass), the sashimi and whole grilled fish du jour (entrées run $15 to $38), or the extensive wine list and cocktails. There's a lot going on at PM, and all of it is going really well.