tennessee banana-black walnut cake with caramel frosting

Ingredients For tennessee banana-black walnut cake with caramel frosting

• CAKE
• 1/2 c

  vegetable shortening
• 1 1/2 c

  granulated sugar
• 2

  eggs
• 1 c

  mashed bananas
• 4 Tbsp

  buttermilk
• 1 tsp

  pure vanilla extract
• 2 c

  all purpose flour
• 1/2 tsp

  baking soda
• 1 c

  chopped black walnuts
• FROSTING
• 1/2 c

  butter,softened (1stick)
• 1 c

  packed dark brown sugar
• 1/3 c

  heavy cream,plus more as necessary
• 1 Tbsp

  pure vanilla extract
• 1 box

  confectioners' sugar (16oz box)