Rhubarb Streusel Coffee Cake

Ingredients

• 1/2 cup butter-flavored shortening
• 1 1/2 cups brown sugar
• 1 cup buttermilk
• 1 large egg
• 2 teaspoons vanilla extract
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 cups flour
• 2 1/2 cups chopped rhubarb
• 1/2 cup granulated sugar
• 1 teaspoon cinnamon
• 1/2 cup chopped pecans (optional)
• 1/2 cup shredded coconut (optional)