Daily entries from the 17th century London diary
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Buttered ale must have been a horrible concoction, as it is described as ale boiled with lump sugar and spice.
http://www.florilegium.org/files/BEVERAGES/wassail-msg.html discusses buttered beer.
Once more Samuell gets his name in print:OED:
4. buttered ale: a beverage composed of sugar, cinnamon, butter, and beer brewed without hops. Obs.
1662 PEPYS Diary 5 Dec., And give him a morning draught of buttered ale. 1667 Ibid. 28 Sept., It will cost him..£300. in ale, and £52. in buttered ale.