A British sailor named Charles Lightoller visited San Francisco in the late 1800s and raved about the "'Frisco biscuit" he ate there. Carl Merritt read that in a book and wondered: "What is a Frisco biscuit?" That little question took us on a long journey for the answer.

Additional Reading:

• Ever Heard of a 'Frisco Biscuit'? Neither Had Many Maritime Historians
• Is There Treasure At the Bottom Of San Francisco Bay
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This story was reported by Gabriela Glueck. Bay Curious is made by Olivia Allen-Price, Katrina Schwartz and Christopher Beale. Additional support from Jen Chien, Katie Sprenger, Maha Sanad, Alana Walker, Holly Kernan and the whole KQED family.