Where did Asuka think "Monaka" came from?
Here is what Asuka said in Japanese:

なるほど…最中【もなか】。私達【わたしたち】は青春【せいしゅん】真っ【まっ】最中【さいちゅう】～的【てき】な？
I see... monaka. We're in the middle of our youth~ or something?

The idea is, 最中 (in the middle) is usually read as &quot;saichuu&quot;, but also has another reading of &quot;monaka&quot;. As for why Asuka connected it to &quot;youth&quot;, it's a common idea that school life is related to youth life.

Monaka itself is actually a wafer cake filled with the bean jam. The origin of monaka is from 最中【もなか】の月【つき】 which has the meaning of &quot;the shape of full moon&quot;.