It's a golden rule of commonplace cuisine: Where there is meat, there should be potatoes. Steak and rice? No. Steak and pasta? Absolutely not. Steak and potatoes. Unquestionably. They just belong together. At Tuscan Steak, however, they are kept separate, dished out à la carte. A good thing perhaps. Although the restaurant offers enormous cuts of exceptional beef, they also serve the most spectacular mashed potatoes that have ever passed our lips. Thick buttery potatoes flecked with bits of smoked onion or sweet potatoes mashed and zinged up with a splash of Amaretto. Hold the sirloin, the T-bone, and the filet mignon, and bring on a bucket of these luscious spuds.