Birchwood trays are generally considered food safe. Birchwood is known for being non-toxic and is often used in food-related products, including serving trays, utensils, and cutting boards. However, to ensure the safety of the birchwood tray you have, it's recommended to check the product details and any manufacturer's information. Additionally, if the tray has any finishes or coatings, make sure they are food-grade and free from harmful chemicals.