Buttermilk cupcakes with pineapple filling recipe

Ingredients

• 1 cup shortening
• 3 cups sugar
• 2 cups buttermilk
• 4 cups sifted cake flour
• 4 egg whites, beaten stiff
• 3 tsps baking powder
• 1/2 tsp baking soda
• 1 tsp salt
• 1 tsp vanilla
• 1/2 cup white sugar
• 4 tablespoons all-purpose flour
• 1/8 teaspoon salt
• 1 egg
• 1 cup diced fresh pineapple
• 3/4 cup pineapple juice
• 1 tablespoon butter
• 1 pkg ( 8 oz) cream cheese, room temperature
• 1/4 cup butter
• 1 cup confectioners sugar