When ready to make the pizza, preheat oven to 425F/220C and line two baking sheets or prepare pizza stones.
Knock back the pizza dough (prod with your fingers after turning it out of the bowl) and divide into 2 (or more/less if increasing/decreasing recipe). Keep the piece(s) you are not working with to one side, covered, while you work on the one pizza. Quarter the pear and remove the core then cut into relatively thin slices. Slice the mozzarella and cut larger slices. Finely chop the sage.
Roll or stretch the pizza dough into a circle or rectangle, as you prefer, and as suits your baking sheet/tray, and place on the lined baking sheet - I prefer a very thin pizza base for this but you can make a little thicker if you prefer.
Spread half the squash sauce (or proportional amount, if increasing/decreasing recipe) over the pizza dough so it is fairly even and leaves a small rim around the edge without the sauce. Spread the pear slices evenly over the top then sprinkle over the bacon jam and add the slices of mozzarella in between, or with some jam on top, spacing evenly over the pizza. Top with grated parmesan and the sage. Repeat with other pizza base and toppings.
Bake the pizza for approximately 15-20 minutes until the dough is browning and the cheese is just starting to brown as well.