Koi   At an out-of-the-way little storefront on Dillingham in Kalihi, chefs Marcos Rebibis Jr. (formerly of Sansei and Brew Moon restaurants) and Eric Bond (a calabash relative who trained in New York) turn out what's come to be known as "gourmet plate lunch" six days a week. They also stock a lunchwagon and handle the catering orders that are their true bread and butter. You can get a delicious (and guilt-free) grilled steak and equally meaty mushrooms on a bed of romaine with carrots, tomatoes, croutons and cheese and a house-made balsamic dressing for $7.50. You can fax in your order, and there's parking and a smattering of seats, if you want to eat in. As you'd expect, tables fill up during the lunch rush.  2028 Dillingham Blvd. 845-4564. koi808.net. 10:30 a.m.-1:30 p.m. Mondays-Saturdays. AX, MC, VS.