Chocolate Fudge
["2 c. sugar", "1 or 2 sq. chocolate *", "2 Tbsp. corn syrup or 1/8 tsp. cream of tartar", "2/3 c. milk", "1 tsp. vanilla", "2 Tbsp. butter"]
["*Three level tablespoons of cocoa + 1 tablespoon of oil = 1 square chocolate."]
["sugar", "chocolate", "corn syrup", "milk", "vanilla", "butter"]