Little Cay – Latin Caribbean Kitchen unites many far-flung flavors of the Caribbean, with mixed results. A vibrant design theme runs through the high-ceilinged dining room. People clench churrasco steak sandwiches, fork into vaca frita, sip Cuban coffee at a long, bright bar. Service is nice, warm. Some of the classics could use more zap, like that vaca frita and simply fried plantains. The move here is to embrace the riffs, such as a ropa vieja French dip sandwich and “tostonadas” — which are like open-faced sandwiches but on plaintains and mounded with toppings like lechon (slow-roast pork).