okara (i.e. soy pulp, a by-product of making soymilk or tofu)
Definitions (粵典–words.hk)
名詞
偷工減料嘅建築 incomplete and fragile construction work where shortcuts have been taken; literally: tofu dregs
豆腐渣工程
豆腐渣工程
dau6 fu6 zaa1 gung1 cing4 jerry-built construction
條橋起好幾日就冧,擺明係豆腐渣啦!
条桥起好几日就冧,摆明系豆腐渣啦!
tiu4 kiu4 hei2 hou2 gei2 jat6 zau6 lam3, baai2 ming4 hai6 dau6 fu6 zaa1 laa1! The bridge collapsed a few days after the completion. It is clearly jerry-built!