Old-Fashioned Rhubarb Cake Recipe

Ingredients

• 1 1/2 cups white sugar
• 1/2 cup butter
• 1 egg
• 1 teaspoon vanilla extract
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• 1/4 teaspoon salt
• 1 cup buttermilk
• 2 cups rhubarb, chopped
• 1 tablespoon all-purpose flour
• 1 cup packed brown sugar
• 1/4 cup butter
• 2 teaspoons ground cinnamon