In America, mothers used to warn their sons that in choosing a mate, "Cooking lasts, kissing doesn't." ThatThe parallel with the Japanese proverb is, go for "permanent" qualities, not "transient" onesperfect, but pretty strong.
Put another way, flowers are pretty to look at, but dumplings are something that you can actually eat.
A mother who would choose "cooking" over "kissing" for her son, would also choose "dumplings" over "flowers."