"The biggest mall" may make you think of more than 4 shops, so be forewarned that it isn't huge.
That said, it has a sushi section, Japanese gifts section (very tiny), and bakery area.
The other part of the "mall" is full of Japanese sauces, and all these special products that you can't find anywhere else, even in Chinatown, T&T or Scarborough.
Try the onigiri and the other lunch specials!