Langer's Deli
Operating opposite MacArthur Park since 1947, Langer's is renowned by almost every major food critic—including Kenji—as serving the single greatest pastrami sandwich in America. Go straight for the iconic "Number 19," where thick-cut, hand-sliced, five-hour steamed pastrami is layered with Swiss cheese, coleslaw, and Russian dressing on double-baked rye bread that crackles at the crust. The space is a charming, retro Jewish-style diner that gets packed for lunch, and while $$$ ($35-$40 a head) is steep for a sandwich, it's a verified steal for a bucket-list bite.