The word "drizzle" doesn't really work for Vegemite. It's pretty solid unlike jam or honey and can only be spread, not drizzled.

How I have it: medium toast. A heavy spread of butter or margarine. Then a heavy but specifically uneven spread of Vegemite. Parts of it should have roughly as much Vegemite as usually recommended to newcomers. But parts should be a thick mixture of the Vegemite and butter that might be as much as 4 mm thick.