KanjiJLPT N1
Superintend

superintend, manager, rule

Mnemonic

Under the roof of the imperial palace, the chief minister bites into a spicy pepper before each session—its searing heat keeps his mind razor-sharp so he can superintend every affair of state. The spicier the pepper, the fiercer his authority over the court.
Additional thoughts
Picture the roof as the seat of power, and the spicy burn as the fierce discipline needed to govern. The pain of spice equals the burden of command.
Quick recall
A roof-covered minister eats a spicy pepper to sharpen himself and superintend the realm.

Details

The keyword for 宰 is superintend. This kanji conveys the idea of overseeing, managing, or taking charge of affairs, particularly in an administrative or governing capacity. Historically, it referred to a high-ranking official or minister who directed and controlled important matters of state. The sense is one of authoritative supervision and governance over people or operations.
On'yomi
さい