Uhh... Am i missing some context here? I don't get it.
I'm guessing the tone of voice Miho used when she said "Yukari" (the name of the dish and also the girl) was particularly loving. That flusters Yukari, which flusters Miho, and Saori is left eating her yukari as a lame third wheel while the lesbians are having a mutually reinforcing blush-meltdown.
Saori is the most wanting to be popular and in love, and so when she sees others being so lovey-dovey, she can't help but be a little jealous... is what I'm guessing.
Anyways, the artist on Twitter also pointed out the previous time that Saori went "munch" at the end of the comic: post #6764872.
