The suggestion that a restaurant ought to be a dining destination because of the rice it serves might be considered hyperbole. At the new Zaytoona (104 Triad Center W, O’Fallon, Missouri), however, that’s only by a bit. That was our thought when a platter of skewered and grilled chicken chunks arrived at the table—along with a sumac-dusted salad—atop a fluffy hillock of basmati rice the bright yellow of a spring daffodil, with a lemony tang.