"Robię zupę z cebulą i marchewką."

Translation: I am making soup with onion and carrot.

[Scott101822]

The article is unnecessary. "I am making onion and carrot soup" is correct and more common.

[Jellei]

Yeah, I think you're right... changed now.

[AlexG71]

Would it also be correct to say 'I am making soup from (using) onion and carrot'?

[Jellei]

I would say that "from", "out of", "using" change the case to Genitive, so that would be "z cebuli i marchewki".

[AlexG71]

Dziękuję!

[PolishBagel]

Should "marchewką" sound like "mar-lev-ka'?

[jagonics]

See this: https://en.wiktionary.org/wiki/marchewka#Pronunciation

[PolishBagel]

Dzięki! This makes more sense.

[Jack.Elliot]

I am making a carrot and onion soup

[WarsawWill]

I think we need an "and". In Britain, for example we have "leek and potato" soup, and I'm about to go off and eat my "carrot and coriander" soup.

[SonofMaat]

What's the difference between a 'marchew' and a 'marchewka'?

[Jellei]

I'd say that "marchew" is a mass noun and "marchewka" denotes one carrot... but actually they could be used the other way round as well ;) At least I can imagine my mom saying "Kup marchewkę" and she won't mean one carrot.

[Weylin366674]

Does the order of "cebulą i marchewką" have any significance?

[Kendra800150]

Could this construction also be used in a situation where the "primary" ingredient that would define the type of soup is something else, but it also contains onions and carrots? For instance, I make lentil soup with onions and carrots.

[Jellei]

Yes. Actually we mostly use adjectives for describing the soup, just like English does: zupa pomidorowa = tomato soup. So here 'with' is indeed just 'with', whether those are main ingredients or not.