Creamy, Frothy Dessert Based on Old Popular Drink

Puzzle 6 of Spy World Medium Pack

Question is: Creamy, Frothy Dessert Based on Old Popular Drink

and the answer is: SYLLABUB

Word Meaning:

SYLLABUB — A drink dating back to the 16th century consisting primarily of milk curdled with an alcoholic beverage or some acid such as lemon juice, which is usually then sweetened and spiced.

Definitions from Wiktionary.