UTS is more of a mix, UNSW probably has more asians (% wise) than UTS, and as for food, it's the Union Food court, Maccas/KFC/Subway/Oporto/Hungry Jacks - Central Station, or Haymarket/Market City (massive food court with a truck load of asian stores and others level 3 & 4 iirc).
Plenty to eat.