Sushi Sai, 123 N. Wacker Drive, Suite 125; 312-332-8822 The entrance is not really on Wacker, so turn onto Randolph and climb a few steps to this serene sushi bar and restaurant. You can dine in easily enough, but you can stop in and order a "lunch box" (a variety of them are available 10 a.m.-3 p.m.). We did, and were out the door in less than 10 minutes with our delicious lunch of shrimp tempura roll and spicy tuna roll ($9.95). The tempura still had crunch, the tuna was lush. The menu also boasts 25 sushi/sashimi items and 30-plus rolls.