A friend and former Chelsea resident suggested Teriyaki Yummy over all other area Asian cushion restaurants. Their menu consists of a great combo of Chinese and Japanese faire.
I typically order shumai. The first order I had, the pork was a bit undercooked. Since then I'm hesitant and bite halfway threw one to make sure it's done. I usually follow up with their version of General Gao's chicken which packs a small punch.
Sushi is on the menu, but it's very small and expensive. I'd suggest taking a trip over to the Market Basket sushi counter. Hopefully they will re-open with the grocery store soon.
Delivery does take sometime, twice a coworker has asked what day I was ordering for. Average wait is around 45 minutes, which is long because we are down the street.