We stayed there in Sept and ordered a lunch room service but i'm pretty sure that the Jiko menu is available. We just got one lunch (2 credits). We were on the deluxe plan so it included the cheese plate with crackers (app.), club sandwich with fruit salad (entree), and dessert trio, and drink. We shared it with 3 of us and still had a bit left. Be careful if you order the cheese plate through room service because they can sometimes accidentally charge it as an entree and use 2 extra credits.
They set out a white table cloth and layed out the food beautifullly.
I do believe that you can order off the Jiko menu, but I'm not positive. BUT, what we DID do was go down to the the bar at Jiko and order our meals as take out. They had everything ready in a few minutes and all bagged up with cloth napkins and real silverware and we just had to sit the containers outside our door when we were done. The best part was that for our drink credits, the bartender made us some lovely non-alcoholic sunset cocktails to sip on and take with us while we waited for the meal to be ready.