This tart is almost as stunning as it is delicious! It contains the complementary flavors of apples and walnuts – with the walnuts starring in the frangipane base. What is frangipane? Most commonly it is a baked pastry cream made with finely ground almonds, eggs, butter and various flavorings. If you have ever had a Bakewell tart – you have had frangipane. This recipe replaces the almonds with walnuts since they are the perfect pairing with apples.