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> 友達が教えてくれた **の** と同じようにカレーライスを作ったら、とても美味しく出来た。

The sentence appears in my Japanese textbook. To me, it sounds natural to join
くれた with と同じ directly, but I don't know if it's also correct:

> 友達が教えてくれたと同じように…

What is the function of this の here, and is it absolutely necessary?

よろしくお願いします
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question
particle-の
Is の absolutely necessary in the following sentence?
Yes it's absolutely necessary. 同じ is a [special
adjective](https://japanese.stackexchange.com/a/30574/5010) and thus cannot be
"joined" using と. This と is a "comparison target marker" explained in the
following questoins:

  * [How is と used in these sentences?](https://japanese.stackexchange.com/q/57038/5010) (See the last half of Chocolate's answer)
  * [What about this combination of と and や](https://japanese.stackexchange.com/q/52559/5010)

Therefore, the nominalization using の is mandatory. It is also possible to
interpret this の as a pronoun meaning "the one". That is, 友達が教えてくれたのと同じように can
be translated either as "like my friend taught" and "like the one my friend
taught".
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