Irish Staple Has a Liquid Raising Agent, Not Yeast
Puzzle 18 of Solving a Mystery Easy Pack
Question is: Irish Staple Has a Liquid Raising Agent, Not Yeast
and the answer is: SODABREAD
Word Meaning:
SODA BREAD — (cooking) Bread made using sour milk and bread soda (baking soda) as a raising agent, rather than yeast; common in Ireland.
Definitions from Wiktionary.