Old Fashioned Chocolate Fudge

3tablespoons Mazola or Nucoa margarine
3cups sugar
2tablespoons Karo light or dark corn syrup
2(1-ounce) squares unsweetened chocolate
¾cup milk
1teaspoon vanilla
1cup walnuts, coarsely chopped (optional)

Grease 1 (8 × 8 × 2-inch) pan. Place margarine, sugar, corn syrup, chocolate and milk in a heavy 3-quart saucepan. Cook over medium heat, stirring constantly, until mixture boils. Continue cooking, stirring occasionally until temperature reaches (238°F.) or until a small amount of mixture dropped in cold water forms a soft ball. Remove from heat. Add vanilla. Cool to lukewarm (110°F.). Beat until fudge begins to thicken and loses its gloss. Fold in nuts. Quickly pour into prepared pan. For best results do not spread fudge or scrape out of pan. When cold, cut in squares. Makes 2 pounds.