In large mixing bowl beat together brown sugar, oil, water and egg.
In medium mixing bowl combine flour, SACO Cultured Buttermilk Blend, baking soda and salt; add to brown sugar mixture.
Mix in vanilla.
Stir in rhubarb and nuts; blend well.
Pour into prepared pan(s). - See more at: http://www.sacofoods.com/recipes/view/rhubarb-bread#sthash.gEcgggZT.dpuf) 2. topping (In large cup stir together topping ingredients. Sprinkle evenly over batter. Bake 45 to 60 minutes, or until wooden toothpick tests done.