National Walnut Day is observed worldwide every May 17 to celebrate walnuts, which are recognized for their health benefits and culinary versatility. The holiday was initiated in 1949 by the Walnut Marketing Board to promote walnut consumption and support the California walnut industry. In 1958, Senator William Knowland introduced a resolution to officially recognize May 17 as National Walnut Day, which was approved by President Dwight D. Eisenhower. On this day, people are encouraged to enjoy walnut-based recipes, such as walnut pie, and incorporate walnuts into various dishes. Walnuts are rich in unsaturated fats, protein, and essential vitamins and minerals, making them a nutritious addition to diets. The day highlights the significance of walnuts in cuisines, particularly in Iranian and Georgian dishes.