For example, you may replace meat and saussage (kielbasa) in bigos (sauerkraut stew) with smoked tofu and dried soy protein. Put some more smoked plums in it as well, and you'll get a very tasty vegetarian bigos.
WTF?
The same as pierogi are different types of dumplings. We have different types of potatoe dumplings:szare kluski (served with cabbage stew (z kapustą),
You mean, without lard?
In the South (Lesser Poland, Tatry and Beskidy mountains) you can find fried cheese (smazony ser) or grilled oscypek cheese with cranberries (grilowany oscypek z zurawina). In the East you can find bliny pancakes and some pies or even saussage made of grated potatoes and onions (but be careful - they may contain lard as well).
Now, that makes more sense...
I would not recommend to 'convert' bigos to a vegetarian dish or serve szare kluski without lard or meat sauce. No, really... When I image pieces of tofu melting in bigos, it's just horrible...
While spoil meat dishes with surrogates? The taste of good bigos mostly depends on meat, so you simply can't make bigos on tofu. It's like replacing the sauerkraut in bigos with something else. It won't be bigos, any more.
Or some dried soya protein... it sounds not like food but like some ersatz. And taste like that, too. All those soya chunks, soya pâté and stuff - it's awful. I think some vegetarians are a bit masochistic. Those meat dishes with soya equivalents have taste and texture of toilet paper, and it's so conspicuous, that they are an impoverished versions of other dishes. Why eat that stuff while there is an alternative? There's a lot of stuff you can do with beans, lentils, chickpeas etc. with a full, rich taste, which was never meant to contain meat, so tastes great without it. A vegetarian doesn't have to eat processed soya, because there are tastier and more natural sources of proteins. And, btw, these are the cheapest sources of proteins in the market.
Coming back to the bigos issue: don't make it with tofu! It's a goddamn profanation. Bigos is not for vegetarians - accept it and get some normal vegetarian meals.