When my mom is lazy, she cooks Tua Chye Perng or Chinese green mustards rice. 大菜饭 The same vege 大菜 is used to make pickled kiam chye or salted vegetable. It was a recipe handed to her by her mother or my late grandmother. It was humble food popular with the poor people of Fujian, China. It is a cost saving meal as no separate dishes are required.
Historically, the Minangkabau people of Sumatra were of a migrating (merantau) culture. Many left home to start new lives in other Indonesian cities, as well as at regional countries. Soon, Padang restaurants were everywhere.
But there was one problem when they wanted to take food along their long journeys through rivers and oceans. Refrigerators weren't available in the 16th century.