lunar rhubarb cake

Ingredients For lunar rhubarb cake

• 1/2 c

  butter or margarine
• 1-1/2 c

  sugar
• 1

  egg
• 1 tsp

  vanilla extract
• 2 c

  sifted all purpose flour
• 1 tsp

  baking soda
• 1/2 tsp

  salt
• 1 c

  buttermilk
• 2 c

  rhubarb - cut in 2" pieces
• 1 Tbsp

  flour
• 1/4 c

  butter or margarine
• 2 tsp

  cinnamon
• 1 c

  brown sugar, firmly packed