All agesBilly loves Harmony Day. He loves the colours, the clothes and especially the food. This year Tayta is making kaak, a Lebanese treat, for Billy to share with his class but he can’t share the recipe because Tayta bakes with a secret ingredient.Tayta’s Secret Ingredient is a heart-warming intergenerational story about everyday life in multicultural Australia, where a curious boy takes centre stage alongside his beloved baking grandmother.