PREHEAT oven to 350 degrees and grease a 9x13 inch pan.
Combine rhubarb and 1/2 cup sugar together in a bowl and set aside for at least 20 minutes.
Meanwhile, mix together flour, cinnamon and salt. Stir in mixture of
oil, additional sugar, vanilla and egg; mix well. Add baking soda to
the cup of buttermilk and stir into the cake batter. Fold in the
Pour into the prepared baking pan and sprinkle with topping (recipe
below). Bake for 50 to 60 minutes or until a toothpick comes out clean.
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