Gluten-free Banana Cake

Ingredients

 * 7 eggs, separated
 * 1 cup sugar
 * 1 cup potato starch flour
 * 2 to 3 mashed bananas
 * 1 cup ground walnuts
 * fresh strawberries, sliced
 * ground walnuts for garnish

Directions

 * beat whites until stiff and set aside.
 * in separate bowl, beat yolks and sugar together.
 * add potato starch slowly, beating to a smooth consistency.
 * add mashed bananas and groundnuts.
 * gently fold mixture into whites.
 * grease bottom but not sides of tube pan.
 * pour batter into pan and bake at 350 °F for 45 minutes.
 * turn pan upside down and let cool.
 * garnish with strawberries and ground walnuts.