Delicious sandwiches and rare coffee are hiding inside this Bay Area library

Many wondrous surprises lurk inside public libraries. Literary marvels. Decades of archived newspapers. Endless volumes of storybook fantasies. But at one Bay Area library, it’s a delicious Vietnamese sandwich that’s stoking imaginations and appetites.

Prologue Coffee & Tea has been slinging fresh, thoughtfully prepared banh mi inside the Walnut Creek Library since the cafe opened in June. Proprietor Thuy Nguyen left a 20-year career in banking to open the cafe, which is accessible via the library, as well as a separate entrance on North Broadway. Prologue is named for the beginning of this new chapter in Nguyen’s life, but it’s also a love letter to her daughter and a way for Nguyen to share her flair for Asian-inspired drinks like dalgona matcha, banana milk coffee and a charcoal rose latte with Japanese activated charcoal.

“I was just always intrigued by making coffee and tea drinks for my family and friends,” Nguyen recently told SFGATE. “It was a hobby. I never really thought about opening a coffee shop.”

That hobby flourished into a business when Nguyen’s daughter reached school age and she felt like she didn’t have time for her while working an 8-to-6 corporate job. “My purpose is my daughter,” she said. “It’s in the library, and I can bring my daughter here, and she can read........

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