Ingredients

• 1 cup brown sugar
• 1/2 cup vegetable oil
• 2 teaspoons vanilla
• 2 1/2 cups flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 1 cup buttermilk
• 1 1/2 cups rhubarb, chopped
• 1/2 cup chopped pecans or 1/2 cup walnuts
• 1/3 cup sugar
• 1 tablespoon cinnamon
• 1 tablespoon butter
• 1 egg