haha ha, karaage to edamame wo ookii sara ni moritukete kuremasita.

Yes. In a sentence like this, 母 usually means my mother.

Japanese often leaves out things that are clear from context, so 私の母 is often shortened to just 母. Also, when talking about your own mother to someone else, Japanese commonly uses 母 rather than お母さん.

A rough contrast is:

• 母 = my mother, in a more neutral/descriptive way
• お母さん = mom / mother, often used when speaking to her directly or referring to someone else’s mother more politely

So here, 母は is naturally understood as As for my mother, ...

は marks 母 as the topic of the sentence.

So 母は means something like:

• As for my mother, ...
• My mother, ...

This sets up mother as the thing the sentence is about.

If you used が instead, it would sound more like you are specifically identifying mother as the subject in a way that may feel more contrastive or newly introduced. In many ordinary sentences like this, は is the most natural choice because the speaker is simply talking about what their mother did.

Because 唐揚げ and 枝豆 are joined together as one combined object of the verb.

• 唐揚げと枝豆 = fried chicken and edamame
• を marks the thing being acted on

So the sentence treats fried chicken and edamame as the things that were plated.

You can think of it like:

• [唐揚げと枝豆]を盛り付ける
• to plate [fried chicken and edamame]

You do not need a separate を after each noun.

Here, と means and.

So:

• 唐揚げと枝豆 = fried chicken and edamame

This と is used to connect nouns in a complete list.

大きい皿に means onto a big plate or on a big plate.

Here:

• 大きい = big
• 皿 = plate/dish
• に marks the target/place where something is put

With a verb like 盛り付ける (to arrange/serve/plate food), に marks the dish or surface the food is arranged onto.

So:

• 大きい皿に盛り付ける
• to plate it on a big dish

Because 大きい directly modifies 皿 as an adjective.

Japanese i-adjectives go straight before the noun:

• 大きい皿 = a big plate
• 小さい皿 = a small plate
• 熱いお茶 = hot tea

This is similar to English adjective + noun order.

Yes. 大きい皿 and 大きな皿 are both possible.

Both mean a big plate, but there can be a slight nuance difference:

• 大きい皿 = straightforward descriptive big plate
• 大きな皿 = can sound a little more literary, expressive, or stylistically soft

In everyday speech, 大きい皿 is very normal.

The basic verb is 盛り付ける.

It means:

• to arrange food on a plate
• to serve neatly
• to plate up

So the core action is that the mother plated/served the fried chicken and edamame on a big dish.

Because くれる is attached to the て-form of the main verb.

Pattern:

• Vてくれる = someone does something for me / for us / for someone in my in-group

So:

• 盛り付ける → 盛り付けて
• 盛り付けてくれました = (she) plated it for me/us

The て-form links the main action to the helping/giving verb くれる.

It adds the idea that the action was done for the speaker’s benefit or for someone close to the speaker.

Compare:

• 盛り付けました = plated/served it
• 盛り付けてくれました = plated/served it for me/us

So くれる is not just about the physical action. It also shows the speaker feels that this was a beneficial action received from the mother.

This is a very common and important Japanese pattern.

Usually, it is the speaker or the speaker’s in-group, even though it is not explicitly stated.

So this sentence naturally implies something like:

• Mother plated the karaage and edamame on a big dish for me
• or for us (for the family/group including the speaker)

Japanese often leaves that receiver unstated when it is obvious from context.

Because the action has already happened.

• くれます = does for me / will do for me
• くれました = did for me

So the sentence is talking about something the mother already did: she plated the food on a big dish.

Yes. It is polite because it ends with くれました, which is the polite past form.

A less polite/plain version would be:

• 母は、唐揚げと枝豆を大きい皿に盛り付けてくれた。

That would be fine in casual speech or writing, but くれました is the polite version.

Because Japanese often omits information that is understood from context.

In English, you might say:

• My mother plated the fried chicken and edamame on a big dish for me.

In Japanese, if for me/us is already clear, it is usually left out, especially when くれる already signals that the action benefits the speaker or the speaker’s side.

They are read:

• 唐揚げ = からあげ
• 枝豆 = えだまめ

These are very common food words.

• 唐揚げ usually refers to Japanese-style fried chicken
• 枝豆 means edamame, immature soybeans often served in the pod

The commas mainly help readability and pacing.

• 母は、唐揚げと枝豆を大きい皿に盛り付けてくれました。

Japanese commas are often used more flexibly than English commas. They can show a pause, make the sentence easier to read, or separate chunks clearly.

This sentence could also be written without those commas, and the grammar would still be fine.