Cut the bacon into large pieces. Sautee them in a pan until they start to get crispy on the edges. Thinly slice your apples on a mandoline. Drizzle the olive oil over the pizza dough and rub to cover the pizza with oil. Sprinkle the bacon pieces over the pizza pie and add the shredded mozzarella and gruyere. Top with sliced apples and fresh rosemary. Sprinkle a small pinch of sea salt over the pizza.