Vlaai (plural vlaaien) is a pastry consisting of dough and a filling, traditionally associated with the provinces of Limburg found both in the Netherlands and Belgium, as well as parts of Germany across the border.
A vlaai is usually 26 - 31 centimetres in diameter. It is available in many different varieties of fruit fillings, such as cherry, apricot, strawberry, and plum. Other variations are a crumbled butter and sugar mix ("greumellevlaai" in Limburgish, or "kruimelvlaai" in Dutch) and a cooked rice and custard porridge ("rijstevlaai").
Vlaai is often eaten on special occasions and for significant life events, particularly in the Dutch province of Limburg, such as birthdays and funerals. When eaten on the occasion of a funeral, the vlaai is typically made with black plum ("Zwarte pruimenvlaai").
Belgian immigrants to the United States brought the vlaai tradition with them, and it endures in some corners of Wisconsin, where it is usually called "Belgian pie".