画饼充饥huà bǐng chōng jī

画个饼子来解饿。本比喻徒有虚名而于实际无好处。后多用来比喻以空想来安慰自己。

例虽然不曾定个来期，也当画饼充饥，望梅止渴。——明·冯梦龙《警世通言》

英appease one's hunger with depicted cake; draw cakes to allay hunger—feed on illusions;