Line a cookie sheet with foil; spray with Pam. Spray a large tablespoon with Pam for dropping candy and set aside. Mix brown sugar, sugar, corn syrup, and water in a microwaveable bowl. Microwave uncovered on HIGH for 6-8 minutes, WITHOUT STIRRING. Stir in margarine and vanilla. Add PECAN SHED PECANS and let stand for 2 minutes. Stir vigorously until mixture thickens and turns opaque (1-2 minutes). QUICKLY drop by tablespoons onto cookie sheet. If mixture sets before you have finished, microwave on high for 30-45 seconds, then continue dropping until finished. VERY GOOD and EASY. Makes about 30 pralines.