Saigon Grill
Vietnamese chain. Reliable take-out option. Not currently delivering due to an ongoing labor dispute.
Located at Amsterdam and 90th St, so not strictly in Morningside Heights, but they deliver to the area.
Workers are apparently underpaid - aren't we all?
Map
<googlemap lat="40.790233" lon="-73.973168" type="map" zoom="16" width="500" height="300" controls="small"> 40.790233, -73.973168, Saigon Grill (Vietnamese) - rough location </googlemap>