In a saucepan, cook apples and water over medium heat for about 10 minutes or until apples are tender.
Combine 1/2 cup sugar, cornstarch, cinnamon and nutmeg. Stir into the apple mixture. Bring to a boil, cook and stir for 2 minutes or until thickened. Remove from heat. Stir in lemon juice.
Spread six slices of bread with 1/3 cup filling each. Top with remaining bread.
In a shallow bowl, beat the eggs, milk, vanilla and remaining sugar. Dip sandwiches in egg mixture.
Cook on a lightly greased hot griddle until golden brown on both sides.