To find proof as to whether he is "in love" or not, Yukimura pats Himuro on the head from point-blank range. Seeing this, Ibarada, an upperclassman in the Ikeda Lab, talks about the need for a control experiment. In other words, in order to prove that the racing of his heart is because of Himuro specifically and not just because he's facing a woman, Yukimura has to pat Kanade and Ibarada on the head too. Himuro, on the other hand, sets out to prove that food made with love tastes better and cooks, but...
I'll arrange it nicely so 
it looks more delicious.
.سأقوم بتزيينه بطريقة جميلة حتى يبذو لذيذًا أكثر
Ich richt’s schön her,
dass es leckerer aussieht.
Lo adornaré para que se vea más sabroso.
Lo adornaré para que tenga mejor pinta.
Un plat bien présenté
a meilleur goût !
Lo farò di una bella forma, così sembrerà più buono.
Vou deixar bem bonito
pra parecer mais gostoso.
Красиво оформлю, 
чтобы выглядело аппетитнее.