here is one from Taste of Home..I didnt make it yet..but it has excellent reviews.sounds yummy!
Ingredients
1-1/2 cups packed brown sugar
1/2 cup canola oil
1 egg
1 cup buttermilk
1 teaspoon vanilla extract
2-1/2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon salt
1-1/2 cups chopped fresh or sliced frozen rhubarb
1/2 cup chopped walnuts or pecans
TOPPING:
1/2 cup sugar
1/4 teaspoon ground cinnamon
1 tablespoon cold butter
Directions
In a large bowl, combine brown sugar and oil. Beat in egg. Beat in buttermilk and vanilla. Combine the flour, baking soda and salt; stir into brown sugar mixture just until combined. Fold in rhubarb and nuts. Pour into two greased 8-in. x 4-in. loaf pans.
For topping, in a small bowl, combine the sugar, cinnamon and butter until crumbly; sprinkle over batter.
Bake at 350° for 60-65 minutes or until a toothpick inserted near the center comes out clean.
Cool for 10 minutes before removing from pans to wire racks. Cut with a serrated knife. Yield: 2 loaves (16 slices each).
Editor's Note: If using frozen rhubarb, measure rhubarb while still frozen, then thaw completely. Drain in a colander, but do not press liquid out.