2In medium mixing bowl, combine crumbs, pecans, sugar and melted margarine; mix well. Reserve 1/3 cup; press remaining mixture into a 13 x 9 x 2-inch baking pan. Bake 6 minutes. Remove and cool on wire rack.
3Meanwhile, in large mixer bowl, beat cream cheese until fluffy. Gradually beat in sweetened condensed milk. Add eggs; beat until just combined. Stir in lemon juice from concentrate. Carefully spoon mixture atop crust in pan. Spoon reserved crumb mixture to make diagonal stripes on top of cream cheese mixture or sprinkle to cover.
4Bake about 30 minutes or until knife inserted near center comes out clean.