蒸
=
艹
+
烝
:
James II of England's (zh) second attempt at feeding the masses (烝) involves a heap of artificial lawn (艹). In front of the engine ((e)ng1) he cooks it producing a lot of steam (蒸) and making it into a stew.
Mnemonic symbol: a balloon. The Queen of Hearts is disappointed by her balloons. She expected them to float upwards, but in the space station's bathroom, They float randomly in all directions.