Montreal is well known for being a cosmopolitan city where it's possible to find traditional cuisine from almost every country in the world. On this rainy day in May, I decided to put that maxim to the test with a visit to a typical Polish restaurant that opened its doors more than 30 years ago. Located on St. Paul St., one of the busiest thoroughfares in the heart of Old Montreal, the Stash Café is understated in an old grey stone building that's four stories high. The "Stash," as nicknamed by regular patrons, describes itself as a family restaurant that...