imoneun yorireul jeongmal jalhaeseo jumalmada sachondeuri da moyeo.

No. 이모 specifically means your mother’s sister. Korean has different words for different kinds of aunts and uncles, so this is more specific than English aunt.

For example:

• 이모 = mother’s sister
• 고모 = father’s sister

So a learner might miss that this sentence is talking about a very specific family relationship.

는 is the topic marker. It marks 이모 as the topic of the sentence: as for my aunt...

So:

• 이모는 = As for my aunt, ...

This often gives a slight sense of setting the scene or introducing what we are saying about her. It does not necessarily mean she is the grammatical subject of every part of the sentence, just that she is the main topic being discussed.

요리 means cooking or food/dishes, and here it is the object of 잘하다.

So:

• 요리 = cooking / cuisine / dishes
• 요리를 = cooking + object marker 를

In Korean, 잘하다 often takes an object when talking about being good at something:

• 요리를 잘하다 = to be good at cooking
• 수영을 잘하다 = to be good at swimming
• 노래를 잘하다 = to sing well / be good at singing

So 요리를 정말 잘해서 means because she is really good at cooking.

정말 means really. It strengthens the statement.

So:

• 요리를 잘해 = cooks well / is good at cooking
• 요리를 정말 잘해 = really cooks well / is really good at cooking

It is a very common adverb in everyday Korean.

잘해서 is made from:

• 잘하다 = to do well / be good at
• -아/어서 = a connective ending

Here, -아서/어서 gives a reason/cause meaning:

• 요리를 정말 잘해서 = because she is really good at cooking

So the sentence is structured like:

• Because my aunt cooks really well, the cousins all gather every weekend.

This is one of the most common uses of -아서/어서.

It can mean more than one thing, but here it clearly means reason.

Common uses of -아/어서:

1. Reason/Cause
   
   • 비가 와서 집에 있어요.
     = Because it’s raining, I’m staying home.
2. Sequence
   
   • 가게에 가서 빵을 샀어요.
     = I went to the store and bought bread.

In your sentence, it is not a simple sequence like she cooks well and then... It means the cousins gather because of that.

주말마다 means every weekend.

It is:

• 주말 = weekend
• 마다 = every / each

So:

• 주말마다 = every weekend
• 월요일마다 = every Monday
• 해마다 = every year

The particle 마다 attaches to a noun and gives the meaning of each/every time that thing occurs.

사촌 means cousin, and 들 is a plural marker.

So:

• 사촌 = cousin / cousins, depending on context
• 사촌들 = cousins
• 사촌들이 = cousins + subject marker 이

Korean does not always need a plural marker when English does. So 사촌이 could sometimes still be understood from context, but 사촌들 makes it clearly plural: the cousins.

Here 이/가 marks 사촌들 as the grammatical subject of the second clause.

So the structure is roughly:

• 이모는 = as for my aunt...
• 사촌들이 다 모여 = the cousins all gather

This is a good example of how Korean can have:

• one noun marked as the topic
• another noun marked as the subject

That can feel unusual to English speakers, but it is very normal in Korean.

다 means all or everyone here.

So:

• 사촌들이 다 모여 = all the cousins gather

It emphasizes that the cousins gather together, not just a few of them.

Be careful: 다 can also mean everything in other contexts, so the exact meaning depends on what it modifies.

모여 comes from 모이다, which means to gather or to come together.

Conjugation:

• dictionary form: 모이다
• casual present-style form: 모여

This change happens because 모이다 contracts in conjugation:

• 모이다 → 모이어 → 모여

So 사촌들이 다 모여 means the cousins all gather / come together.

모여 is a casual/plain conversational ending. It is less formal than:

• 모여요 = polite
• 모입니다 = formal

So this sentence sounds like:

• informal writing
• casual speech
• a conversational example sentence

If you wanted a polite version, you could say:

• 이모는 요리를 정말 잘해서 주말마다 사촌들이 다 모여요.

Yes. That is one reason this pattern can be confusing for English speakers.

For example:

• 한국어를 잘해요. = He/She is good at Korean.
• 일을 잘해요. = He/She does the work well.
• 요리를 잘해요. = He/She cooks well / is good at cooking.

So in this sentence, 요리를 정말 잘해서 can be understood as:

• because she cooks really well or
• because she is really good at cooking

Both are natural interpretations.

Yes, that is the natural implication, even though the location is not explicitly stated.

Korean often leaves out information that is easy to infer from context. Since the aunt’s cooking is given as the reason the cousins gather, listeners will usually understand something like:

• they gather at her place
• or they gather for her food

But grammatically, the sentence only says that they gather every weekend because she cooks very well. The exact location is omitted.

Korean often links ideas very compactly with connective endings like -아서/어서 and leaves obvious information unstated.

So instead of spelling everything out, Korean often prefers a natural flow like:

• 이모는 요리를 정말 잘해서 주말마다 사촌들이 다 모여.

A more expanded English-style version might be:

• My aunt cooks so well that all the cousins gather every weekend.

Korean is comfortable letting the listener connect those ideas without extra words.