Butter and Sugar Melted Sauce
Puzzle 7 of Sticky Things Piece of Cake Pack
Question is: Butter and Sugar Melted Sauce
and the answer is: CARAMEL
Word Meaning:
CARAMEL — (uncountable) A smooth, chewy, sticky confection made by heating sugar and other ingredients until the sugars polymerize and become sticky.
Definitions from Wiktionary.