haha ha nokorimono no karee ni hikiniku wo sukosi irete, betu no ryouri ni simasita.

母 is the usual way to refer to your own mother when speaking to other people in a neutral or formal way.

• 母 = my mother / one’s mother
• お母さん = mom / mother (often when addressing her directly, or referring to someone else’s mother)

So in a sentence like this, 母は… sounds natural.

は marks 母 as the topic of the sentence.

So 母は… means something like:

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

It does not just mark the subject mechanically; it sets up what the sentence is about.

残り物 means leftovers.

The particle の connects nouns, so:

• 残り物 = leftovers
• カレー = curry
• 残り物のカレー = leftover curry / curry that was left over

Here, の is acting like of or turning one noun into a modifier for another noun.

With the verb 入れる (to put in / add), Japanese often marks:

• the thing being added with を
• the place or thing it goes into with に

So:

• カレーに = into the curry
• ひき肉を = ground meat

This pattern is very common:

• X に Y を入れる = put Y into X

少し means a little.

In Japanese, amount expressions often come after the noun they describe:

• ひき肉を少し入れる = add a little ground meat

This is very natural. It is understood as “some amount of ground meat”.

Other possible expressions exist, such as:

• 少しのひき肉を入れる
• ひき肉を少しだけ入れる

But ひき肉を少し入れる is simple and natural.

入れて is the て-form of 入れる.

Here it connects two actions:

1. she added a little ground meat
2. she made it into another dish

So 入れて、別の料理にしました means something like:

• added ... and made it into ...
• by adding ..., she turned it into ...

The て-form often links actions in sequence, and sometimes shows means or method too.

The standard form is 別の + noun.

So:

• 別の料理 = another dish / a different dish

Although learners may expect な because 別 behaves somewhat like a descriptive word, 別の is the normal and common form before a noun.

Literally, it means:

• made it into a different dish

This uses the pattern:

• X を Y にする = make X into Y / turn X into Y

In this sentence, the thing being changed is understood from context, so it is omitted. The full idea is:

• She made the leftover curry into another dish.

No, not here.

〜にする can mean:

• decide on ~
• make something into ~

In this sentence, because she is changing the curry, it clearly means make into or turn into, not decide on.

So 別の料理にしました means she transformed it into another dish.

Japanese very often omits words that are clear from context.

After 残り物のカレー appears earlier in the sentence, Japanese does not need to repeat it. So in:

• 別の料理にしました

the thing being changed is understood to be the leftover curry.

English usually needs it, but Japanese often leaves it unsaid.

しました is the polite past form of する.

• した = plain past
• しました = polite past

The meaning is basically the same, but しました sounds more polite and is common in textbook-style or neutral polite Japanese.