Last month, In-N-Out Burger made national news when health officials in San Francisco shut down one of its restaurants. The company’s sin: refusing to comply with a law that requires restaurants to ask customers for proof of COVID-19 vaccination. An In-N-Out spokesperson described the mandate as “intrusive, improper and offensive” — and suddenly, the burger chain became a flashpoint in the country’s culture wars. Today, we talk about this beloved company with L.A. Times reporter Stacy Perman, author of the best-selling 2009 book “In-N-Out Burger: A Behind-the-Counter Look at the Fast-Food Chain That Breaks All the Rules.”More reading: Column: What In-N-Out’s vaccine standoff reveals about the California dream Inside In-N-Out Burger’s escalating war with California over COVID-19 vaccine rules ‘We refuse to become the vaccination police’: In-N-Out Burger, and other restaurants defy COVID mandates