Banana Coconut Streusel Cake

Ingredients

• 1/2 teaspoon salt
• 1-1/3 cups sugar
• 1/3 cup buttermilk *see Note
• 3-4 ripe bananas, mashed (if small, use 4.)
• 2 eggs
• 3/4 cup walnuts, ground
• 1 teaspoon vanilla essence
• 5-6 bananas, cut if half in their length