Sentence:  Set the apples in the pastry-lined tin , spread over them three tablespoonfuls of softened butter , with as much brown sugar , a sprinkling of nutmeg , and a fresh bay leaf , then lay on a cover of pastry , and <WSD>gild</WSD> it with beaten yolk of egg . 
Meaning of the word marked with <WSD> tags:  decorate with, or as if with, gold leaf or liquid gold