Ah, remember back in those days when Mutsuki didn't even have a verbal tic...

Nasi goreng hahaha never thought someone used this pun.

Why did she say "nasi goreng" instead of "fried rice"?

Womb-o-Comber said:

Why did she say "nasi goreng" instead of "fried rice"?

Because the fried rice is fried with "Indonesian" style? It looks like the stereotypical nasi goreng.
Or it just happen for the same of pun.

Womb-o-Comber said:

Why did she say "nasi goreng" instead of "fried rice"?

"Nasi goreng", or ナシゴレン (written as Nashi goren), the joke here whenever she said "nashi" it would be changed to "nyashi". Just like laisy said, it's for the sake of the pun.

I don't know what Japanese normally says for fried rice, from what I get, there are many ways to say fried rice.

You can see a similar joke here