Drinks as They Are Mixed by Paul E. Lowe (1904, p.67) — Lowe 1904

Jamaica rum — rumbase
1 wholeSugar cube — sugarbase
water — hot waterdilution
1 walnut-size pieceButter — butterother
nutmeg — nutmegother
  1. Dissolve the sugar in hot water in a tumbler.
  2. Add the rum, top with more hot water, float a walnut-sized piece of butter, and finish with nutmeg.

Garnish: Nutmeg

Nose
Warm butter, nutmeg, and rum spice rise together.
Palate
This is useful because it preserves the buttered-rum branch as a distinct hot-service tradition rather than treating it as merely a flavoured Hot Rum.
Finish
The finish is rich, warming, and spiced.
Summary
A compact hot buttered-rum service from the warming branch.

See also: Hot Rum, Hot Spiced Rum