In a microwaveable big bowl combine sugar and syrup. Microwave for 5 minutes on high (100%). Stir in peanuts. Microwave 2 to 5 minutes. Stiring every 2 minutes or until peanuts and syrup are light brown. Stir in margarine, vanilla and soda until light and foamy. Spread to 1/4 inch thickness on a large well buttered cookie sheet. Allow to completely cool. Break then store in air tight container.