Mom's Chocolate Cake

• 1 1/2 cups flour
• 1 cup sugar
• 1 tsp. baking soda
• 1/4 lb. sweet butter (softened)
• 3 eggs
• 2 sq. baking chocolate (melted)
• 1/2 cup sour cream
• 3 tbsp. water
• 1 tsp. vanilla
• 1/2 cup nuts (ground)