Melt butter in sauce pan. Stir in and heat berries. sugar and lemon juice. When juice of the Aronia berries flows, stir in flour. Cool to room temperature. Meanwhile, line pie pan with crust. Poor in cooled mixture. Pit on top crust; flute; slit. To catch juice, put foil on the pie skirt or cookie sheet. Shape upward around pie pan without covering pie. Bake at 425 degrees until crust is browned, abut 40 - 45 minutes. Cool then refrigerate overnight. The filling should setup nicely.