For this, mix the 4 eggs, 1 cup of sugar, vanilla extract, corn syrup, and 3 tablespoons of margarine in a bowl, until the mixture attains a smooth texture; add the pecans at the end. Once the crust is done, take it out of the oven and spread the filling over it, evenly. Place the pan in the oven again and bake for 25 minutes or till the filling is fully set. Place the pan on a wire rack and when it completely cools, slice the pie in the shape of bars.