danggeuneul yalbge sseoreoseo bokkayo.

을 is the object particle. It marks 당근 as the thing being acted on.

• 당근 = carrot
• 당근을 = carrot + object marker

Because the carrot is what gets sliced and then stir-fried, it takes 을.

A very similar pattern:

• 양파를 썰어요. = Slice the onion.
• 고기를 볶아요. = Stir-fry the meat.

Since 당근 ends in a consonant, it takes 을. If a noun ends in a vowel, it takes 를.

• 당근을
• 오이를

얇게 is the adverb form of 얇다.

Here, 얇게 describes how the carrot is sliced:

• 얇다 = to be thin
• 얇게 = thinly

So 얇게 썰다 means to slice thinly.

By contrast, 얇은 is the form used before a noun:

• 얇은 종이 = thin paper
• 얇은 조각 = a thin slice/piece

So:

• 얇게 썰어요 = slice thinly
• 얇은 당근 = a thin carrot

In this sentence, we need the adverb form because it modifies the verb 썰다.

This is the verb 썰다 plus the connector -어서.

Steps:

• dictionary form: 썰다
• stem: 썰-
• add -어서
• result: 썰어서

Here -아서/어서 connects two actions, often meaning something like:

• and then
• after doing
• sometimes so

In this sentence, it links:

1. 썰어서 = slice
2. 볶아요 = stir-fry

So the sense is slice it thinly and then stir-fry it.

Both -고 and -아서/어서 can connect actions, but they do not feel exactly the same.

In cooking instructions, -아서/어서 often sounds natural when one action leads directly into the next or forms part of a sequence:

• 당근을 얇게 썰어서 볶아요.

This suggests:

• first slice it thinly,
• then stir-fry it.

If you used -고:

• 당근을 얇게 썰고 볶아요.

this is also understandable and grammatical, but it can feel more like a simple list of actions: slice and stir-fry.

So in recipes and process descriptions, -아서/어서 is very common because it shows a smooth action sequence.

No extra object marker is needed because 당근을 already applies to both actions.

Korean often avoids repeating something that is already clear. So this sentence is understood as:

• 당근을 얇게 썰어서 (당근을) 볶아요.

The second 당근을 is omitted because it would be repetitive.

This is very common in Korean:

• 양파를 썰어서 넣어요.
  = Slice the onion and add it.

The onion is only mentioned once, even though it relates to both verbs.

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

In a recipe, instruction manual, or cooking video, the subject is usually understood as something like:

• you
• we
• or just an impersonal instruction

So 당근을 얇게 썰어서 볶아요 can naturally mean:

• Slice the carrots thinly and stir-fry them.
• We slice the carrots thinly and stir-fry them.
• You slice the carrots thinly and stir-fry them.

Korean does not need to state the subject every time if the listener can easily infer it.

볶아요 is the present polite casual form of 볶다.

• dictionary form: 볶다
• polite present: 볶아요

This -아요/어요 style is very common in everyday speech and also in spoken instructions.

Depending on context, 볶아요 can mean:

• stir-fry
• stir-fries
• am/are/is stir-frying

In recipe-style language, it often works like an instruction:

• 볶아요 = stir-fry it

Related forms:

• 볶습니다 = more formal
• 볶아 = casual/intimate
• 볶았어요 = stir-fried / stirred-fried

Both can relate to cutting, but they are used a bit differently.

자르다 is a broader verb meaning to cut.
썰다 is often used when slicing food into pieces.

So in cooking:

• 당근을 썰다 = slice the carrot
• 종이를 자르다 = cut paper
• 머리를 자르다 = cut hair

Because this sentence is about preparing ingredients for cooking, 썰다 is the most natural choice.

Also, 얇게 썰다 is a very common cooking expression meaning to slice thinly.

Some variation is possible, but the original order is the most natural.

Standard order here:

• 당근을 얇게 썰어서 볶아요.

Korean usually puts:

1. object
2. adverb or descriptive element
3. verb
4. connector
5. final verb

So the sentence flows very naturally as:

• carrot + thinly + slice + and then + stir-fry

You might hear small variations in real speech, but for learners, the original order is the best one to follow.

For example, 얇게 당근을 썰어서 볶아요 is not the most natural default order here.

Yes, the form is technically present tense, but in Korean the present form is often used for:

• general statements
• habitual actions
• instructions
• recipe steps
• demonstrations

So even though 볶아요 is present-form grammar, in context it can sound like an instruction:

• Slice the carrots thinly and stir-fry them.

This is very normal in Korean recipes and spoken demonstrations.

A natural pronunciation is close to:

• 당그늘 얄께 써러서 보까요

A few sound changes happen in connected speech:

• 당근을 sounds like 당그늘
• 얇게 is pronounced close to 얄께
• 썰어서 sounds close to 써러서
• 볶아요 sounds close to 보까요

You do not need to change the spelling—these are just pronunciation effects in normal speech.