Pai Lempengan Apel Karamel

Bahan-bahan (24 porsi)

• 3 1/3 cups all-purpose flour
• 1 teaspoon garam
• 1 cup shortening, (butter-flavored)
• 12 tablespoons cold water
• 2/3 cup gula
• 1/3 cup all-purpose flour
• 1 teaspoon kayu manis bubuk
• 3 1/2 pounds apel granny smith, (kupas, buang bijinya, dan potong menjadi irisan setebal 1/4 inci (10 cangkir))
• 1 cup oat gulung, (memasak cepat)
• 1 cup brown sugar, (packed )
• 1/2 cup all-purpose flour
• 1/2 cup mentega
• 1 cup gula merah
• 4 Tablespoons mentega
• 1/2 cup setengah-setengah
• 1 Tablespoon vanila
• pinch Salt