Remove ice cream from freezer to soften in refrigerator. Meanwhile, generously grease the inside of 5-cup mixing bowl with margarine. Mix pecans and Carame deLite cookies together. using fingers, press mixture all around surface of bowl. Place in freezer for about 15 minutes. Remove bowl and carefully spoon vanilla ice cream over all the crumb mixture, covering the entire surface of the bowl in a thick layer. Freeze again about 15 minutes. Remove bowl from freezer and spoon butter pecan ice cream over vanlla ice cream layer, filling in the center so the bowl now has a flat even top. Cover with aluminum foil and freeze overnight. When ready to serve, wrap bowl with a hot wet towel for a few minutes. Turn over and unmold.
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