Preheat oven to 350°F. Spray a 9x13-inch baking pan with non-stick spray.
Base:
In a food processor fitted with the steel blade, process margarine, flour, ground almonds, sugar and vanilla until crumbly, about 20 seconds. Reserve 1 1/2 cups crumb mixture for topping. Press remaining mixture evenly into prepared pan. Bake 20 minutes, until golden.
Topping:
Mix apricot jam with lemon juice; spread evenly over base. Crumble reserved crumb mixture over jam layer. Sprinkle with slivered almonds. Bake 30 minutes longer, until golden. Cool completely.
Cut with a sharp knife into 24 squares, and then cut each in half diagonally to form 48 triangles.
Recipe published in JOY of KOSHER with Jamie Geller Magazine Purim 2014 SUBSCRIBE NOW