gamjarang yangpa, beoseosirang danggeuneul gati bokkasseo.

Here, -랑 / -이랑 means and, connecting nouns in a casual, spoken style.

So:

• 감자랑 양파 = potatoes and onions
• 버섯이랑 당근 = mushrooms and carrots

This form is very common in conversation. It is less formal than -와 / -과.

It can also mean with in other sentences, but here it is clearly just linking items in a list.

This is because -랑 and -이랑 are the same particle, but the form changes depending on how the noun ends.

• after a noun ending in a vowel → -랑
• after a noun ending in a consonant → -이랑

So:

• 감자 ends in a vowel sound → 감자랑
• 버섯 ends in a consonant sound → 버섯이랑

This is similar to how other Korean particles change shape depending on the final sound.

In Korean, when several nouns are listed together as one object, the object particle is often attached only to the last noun in the whole list.

So in:

감자랑 양파, 버섯이랑 당근을 같이 볶았어

the 을 on 당근 can apply to the whole coordinated object phrase, not just 당근 by itself.

This is very normal in Korean. English learners often expect every noun to be marked, but Korean usually does not work that way.

You could think of it like:

• [감자랑 양파, 버섯이랑 당근]을 같이 볶았어

with the whole bracketed phrase acting as the object.

The comma helps separate the list into chunks:

• 감자랑 양파
• 버섯이랑 당근을

It makes the sentence easier to read and can suggest a slight grouping of the vegetables. But grammatically, it is still one overall object list.

Without the comma, the sentence would still be understandable in speech, especially because people pause naturally:

감자랑 양파 버섯이랑 당근을 같이 볶았어

The comma mainly improves clarity.

It can feel slightly grouped as two pairs because of:

• 감자랑 양파
• 버섯이랑 당근

But because of 같이 and the single final verb, the natural meaning is that all of them were stir-fried together.

So the grouping is more about how the list is organized, not necessarily about two separate cooking actions.

If someone wanted to make it even clearer as one flat list, they might say:

• 감자, 양파, 버섯, 당근을 같이 볶았어
• 감자랑 양파랑 버섯이랑 당근을 같이 볶았어

같이 means together.

In this sentence, it tells you that the vegetables were stir-fried together / all at once / in the same pan.

It comes before the verb:

• 같이 볶았어 = stir-fried together

A very similar word is 함께, which also means together, but 같이 is very common in everyday speech.

볶았어 is the past-tense casual form of 볶다, which means to stir-fry / sauté.

Breakdown:

• 볶다 = to stir-fry
• 볶았- = past stem
• 볶았어 = casual past ending

So this is an informal past-tense sentence ending.

A more polite version would be:

• 볶았어요

This sentence is in a casual, informal style.

The ending -았어 / -었어 is used with:

• friends
• family
• people younger than you
• very informal situations

So 볶았어 is casual.

If you wanted to say the same thing politely, you would say:

• 감자랑 양파, 버섯이랑 당근을 같이 볶았어요.

Korean often leaves out the subject when it is obvious from context.

So instead of saying:

• 나는 감자랑 양파, 버섯이랑 당근을 같이 볶았어

a speaker can simply say:

• 감자랑 양파, 버섯이랑 당근을 같이 볶았어

because the listener already knows who did it.

This kind of omission is extremely common in Korean and is one of the biggest differences from English.

Yes. Other common ways to connect nouns are:

• -하고 — casual, very common
• -와 / -과 — more formal or written

For example:

• 감자하고 양파, 버섯하고 당근을 같이 볶았어
• 감자와 양파, 버섯과 당근을 같이 볶았어요

They all mean basically the same thing, but the tone changes.

• -랑 / -이랑 → casual, conversational
• -하고 → also casual and common
• -와 / -과 → more formal

Yes, it is natural, especially in casual speech.

That said, depending on style, a speaker might also say it in a simpler listing pattern, such as:

• 감자, 양파, 버섯, 당근을 같이 볶았어
• 감자랑 양파랑 버섯이랑 당근을 같이 볶았어

Your sentence is still perfectly understandable and natural. It just groups the vegetables a little as it lists them.