Restaurant Zen is owned by the same company that owns Kings Cafe in Toronto and the Zen Gardens restaurants that are in the other major cities in Ontario. However, Restaurant Zen has a different menu than the others. The menu at Restaurant Zen has more of a Japanese influence (lots of sushi and Bento Box meals) and doesn't include Dim Sum.
For tourists visiting Quebec City, it is important to note that Restaurant Zen is about 3 kilometers away from Vieux Quebec, so you may wish to take a taxi (which costs about $10 each way). The restaurant is very charming. It's situated inside of an old house with beautiful Asian-inspired murals painted on the walls.
I visited Restaurant Zen with my boyfriend on Valentine's Day. The restaurant was quite crowded and we were lucky to get a table without a reservation. Restaurant Zen made us a special Valentine's Day meal, which featured a passion fruit elixir, soup, an assortment of appetizers, bento boxes containing our entree (see photo), green tea, coconut cake and chocolate truffles. The meal was beautifully-presented and, at $55 per couple, the meal was very reasonably-priced for what we got. A number of the items in our meal are featured on the regular menu. I highly recommend the rouleau vietnamien, (which are cold minty-flavored spring rolls that are filled with many veggies) and the poulet kung po au soya (little seitan "balls" that have been breaded, fried and covered with sweet kung pao sauce).