Za’atar Day, also known as International Za’atar Day and World Za’atar Day, is observed worldwide every September 23. This holiday celebrates za’atar, a culinary herb widely used in Middle Eastern cuisine, as well as the spice mix that shares its name. The term "za’atar" can refer to several plants in the Lamiaceae family, including Origanum syracium, commonly known as Lebanese oregano. The za’atar spice blend typically consists of ground za’atar mixed with salt, toasted sesame seeds, and sumac berries, with various regional variations. Traditional customs include eating za’atar with pita bread dipped in olive oil, using it to make manakish bi za’atar, and incorporating it into dishes like hummus and roasted vegetables. Za’atar Day is promoted by Your Lebanon, a project dedicated to Lebanese and Middle Eastern cuisine, encouraging people to explore the herb's culinary uses and health benefits. Celebrations may involve cooking with za’atar, making personal spice blends, and sharing experiences on social media with the hashtag #ZaatarDay.