My previous reply - nothing above-average in these three towns, with three recommendations - Taka and Monster in Summit, and Daimatsu in Mountainside - was deleted by an overzealous moderator.
395 Springfield Ave, Summit, NJ 07901
Daimatsu Japanese Restaurant
860 Mountain Ave, Mountainside, NJ 07092
Taka Sushi Restaurant
95 Summit Ave, Summit, NJ 07901