As all the best Cuban cafeterías do, Oasis has plenty of counter. Most patrons simply go to the window and order. They usually ask for the café con leche. Creamy and not sickeningly sweet, Oasis puts out a concoction that restores balance to even the most addled brain. For 32 years Oasis has served café con leche out of a little store near the entrance to Key Biscayne. That's more than three decades of liquid well-being. Of course once your equilibrium is re-established, it's hard not to notice the place also offers hearty lunches and tasty desserts.