In a medium bowl, whisk together the flour, sage & salt. Sprinkle the butter cubes over the flour mixture & use your fingers to work them in. Alternately you could use a pastry cutter to do this.
When the mixture resembles cornmeal with pea-sized bits of butter remaining, stir in cheese with a fork until evenly distributed. Sprinkle 6 Tbsp ice water over mixture & stir with a fork until dough begins to come together. If needed, add an additional Tbsp or two of ice water.
Turn the dough out onto a lightly floured surface & knead for about three times. Gather the dough into a disk & wrap in plastic wrap. refrigerate for at least 30 minutes or overnight.
Pork Filling
Bake potato in microwave, peel & cut into small cubes. Set aside.
Heat oil in a skillet & sauté celery, onion, garlic & bacon together on medium heat until veggies are soft & bacon is cooked. Add ground pork, breaking it up well. Stir in dried herbs & spices. Cover & simmer for about 10 minutes.
Remove from heat & stir in cooked potato & cheese. Set aside to cool.
Apple Filling
In a small saucepan, combine butter, water, cinnamon & brown sugar. Bring to a simmer then add diced apples, raisins, lemon zest & juice. Gently simmer for 5 minutes. Remove from heat & allow to cool.
Assembly/Baking
Divide pastry into 5 equal pieces. On a lightly floured surface (or dry wax paper) roll out each piece of pastry into 7 x 7 1/2-inches. The excess trimmed from the sides will be used for little pastry ‘walls’ dividing the sweet & savory fillings. Roll the excess into a 3-inch length.
From the top of each piece, LIGHTLY make a line across your pastry 4-inches from outside edge. This will help to place your fillings properly.
On the 3-inch wide section of the pastry, place savory filling to cover 2/3 of the area. Place one of the rolled strips after that then place sweet filling on the remaining 1/3 to complete the ‘clanger’. The little rolled piece of pastry divides the savory & sweet filling.
On the sweet side make 3 holes for vents & on the savory side make 2 slashes. This is the ‘code’ to let the person eating the clanger which was savory or sweet.
Preheat oven to 350 F.
Brush the edges of each pastry with egg wash. Lift the pastry from the opposite side over the fillings & seal the edges with a fork.
Brush clangers with remaining egg wash & bake for about 30-35 minutes or until golden.