This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
粏 combines 米 (rice) with 太, but the exact historical development and original meaning are uncertain. It may be a kokuji or a rare variant.
The left side is rice 米, and the right side is thick/fat 太. Imagine a thick, fermented rice paste used for pickling, which fits the reading ぬかみそ (rice-bran paste).
For タ, picture a thick rice paste being tapped into a pickling tub: tap -> タ, and the thick rice mixture becomes ぬかみそ.
the grass is always greener on the other side of the fence; the neighbour's salted rice bran paste (smells sweeter)