Paella is traditionally included on Spanish restaurant menus on Thursdays.
The custom is especially associated with everyday restaurant culture outside Valencia, where a Thursday paella special became a familiar weekly feature. The dish is usually prepared in a large shallow pan and served as a communal main course, making it well suited to a set menu or a shared midday meal.
Several explanations circulate for the Thursday tradition. One links it to household routines: Thursday was historically a busy day before the weekend, so families and restaurant kitchens favored a substantial rice dish. Another popular story connects the timing with domestic staff having time off, leaving household members to eat paella in restaurants. These explanations are cultural lore rather than a single universally proven origin.
The practice should not be mistaken for a rule that paella may only be eaten on Thursdays. Valencian families and restaurants serve it on many days, and regional menus vary. Thursday is simply the best-known recurring restaurant tradition in Spain, much like a weekly special rather than a religious or legal observance.