Preheat oven to 375 degrees F
In a stand mixer or by hand, beat almond paste with sugar and flour, until smooth
Gradually beat in room temperature butter, until smooth, then beat in eggs and egg white, and almond extract
Spread almond filling into pre baked tart shell
Fan pears over almond filling, starting on the outer tart rim and using the larger pear halves
Bake for 45-50 minutes, or until almond filling between pears is slightly browned
Cool at room temperature for 30 minutes
Glaze tart with apricot jam that has been melted on the stove top or microwave