I get that the intended "unnecessary" remark was Ao's backhand compliment to Momo's cooking/baking skills (or lack thereof).
But I prefer the alternate (i.e. incorrect) interpretation that Momo's pout is one of jealousy at the mention of Ikeda's name. (Even though Momo herself totally ships Ao/Ikeda, as seen in this chapter.)
Now I really want some katsudon too.
There's a Japanese restaurant 30 minutes from where I live that serves the best katsudon I've ever had. I hope this whole ordeal is over soon and I can go there... (it's near Gare Montparnasse in Paris, if anyone cares)