Good-Cooking - Blackberry Pound Cake

Ingredients

• 1 cup butter or margarine, softened
• 1 1/2 cups granulated sugar
• 3 cups unsifted flour
• 1 teaspoon salt
• 1 cup blackberry jam
• 1 cup (8 ounces) sour cream
• 1 teaspoon vanilla extract
• 4 eggs
• 1 teaspoon cream of tartar
• 1/2 teaspoon baking soda
• 2 tablespoons ReaLemon reconstituted lemon juice
• 1 cup chopped nuts