White Castle Guides

1 insider guide from real White Castle workers.

White Castle is an American regional hamburger restaurant chain credited as the first fast-food chain in the US. Their square sliders are steam-grilled over a bed of onions rather than seared. Learn about their five-hole patty design and the unique mechanics of the steam grill.

White Castle Slider: The Steam Grill Method

Jun 8, 2026

White Castle steams every slider on a bed of onions. Here's why the five-hole patty exists and how the steam-grill method creates the signature taste.