Open tart is a type of pastry dish that can be filled with either sweet or savory ingredients. The two crossword solutions for this term are FLAN and QUICHE. FLAN is a type of custard tart that is made with eggs, milk, sugar, and sometimes cream. QUICHE is a savory tart that is usually filled with eggs, cheese, and vegetables. Both FLAN and QUICHE are open tarts, meaning that the filling is visible on top of the pastry crust.