Old Fashioned Marble Bundt Cake - cooking recipe

Ingredients

3 ounces unsweetened chocolate
1/4 cup sugar plus 1 cup sugar (I always use unbleached white sugar)
1/4 cup water
1 teaspoon pure vanilla extract
1/4 cup sour cream or 1/4 cup plain yogurt
1/2 cup butter, softened
3 eggs
2 cups unbleached flour
2 teaspoons baking powder
1/2 teaspoon salt
1/2 teaspoon baking soda
1 cup buttermilk
confectioners' sugar (for dusting)

Preparation

Preheat oven to 325 degrees.
Grease an 8\" bundt pan with butter then lightly dust with flour.
In a double boiler melt the unsweetened chocolate with 1/4 cup sugar, water and vanilla extract. Stir. Set aside to cool. (I used a heatproof glass container and melted the mixture in a microwave.).
In a large mixing bowl, cream the remaining 1 cup sugar, sour cream and the softened butter until light and fluffy.
Mix in the eggs one at a time.
Sift the flour with the baking powder, salt and baking soda.
Mixing on slow speed, alternate dry ingredients and the buttermilk into the mixture.
Mixing on low speed, beat until just incorporated, stopping to scrape down the sides.
Once combined, beat on high speed for 2 1/2 minutes.
Set aside 2 1/2 cups of the batter.
Beat the melted chocolate mixture into the large mixing bowl of batter until combined and smooth.
Alternately spoon the plain batter and the chocolate batter in the prepared bundt pan.
Use a butter knife to cut through the batter to create a marble effect.
Bake for approximately 40-45 minutes or until toothpick comes out clean.
Cook cake 10 minutes, invert onto a cake platter.
Dust with confectioner's sugar while still warm.
Yield: One 8\" bundt cake.