Crush whole Oreo cookies in food processor and add melted butter. Press into a 9-inch pie plate. Soften ice cream (this can be done in the microwave on defrost for 3 to 4 minutes) until soft enough to fold in flavoring and food coloring. Mix well. Pour ice cream mixture into crust and freeze
Hot Fudge Sauce
Melt butter in top of a double boiler; drop in chocolate and stir until melted. Add sugar a little at a time, stirring well until all sugar has been added. Add salt. Slowly stir in evaporated milk. After all milk has been added, let cook over hot water until all sugar is completely dissolved, stirring occasionally. This is delicious served over warm cake or ice cream. it keeps in refrigerator for a long time. Always warm sauce before serving.
This pie disappears so quickly that I usually make two at one time.