So what would be the traditional Polish dinner? If it's got kielbasa, I would like an invitation, and I would bring the bottle of vodka.
A traditional Polish dinner will have 2 parts - a soup (pierwsze danie - first course) and drugie danie (second course)
The soup could be a Zalewajka/Zurek (white borsht - a flour based sour soup with sausage and bacon), red borsht (beet soup), mushroom, tomato, dill, or chicken are the most popular of polish soups.
"Drugie danie" is usually meat with potatoes. Breaded pork cutlets with mashed potatoes, dill pickle on the side, and usually some sort of cabbage-based salad (some of it usually sauerkraut-y). It could also be
bigos, which is a very traditional Polish "hunter's stew", and basically consists of cabbage, sausage, pork, bacon, mushrooms, tomato paste, wine, spices.. it tastes nothing like cabbage and it is awesome. You might also find it served as a side.
Dinner is also eaten earlier than in North America. It wouldn't be uncommon to eat dinner at 3pm, for example. Later on in the day "Kolacja" is eaten.. closest translation is "supper", which in north america basically means "dinner" (Right?) .. So it's hard to explain.. but it's common to consume sandwiches for kolacja.
This is all based on what my parents/relatives/friends used to cook when I was in Poland.. and when I went to visit. I'm sure things have changed a lot with the continued Americanization of Poland