Prepare the pizza base according to the recipe or packet instructions.
Preheat the oven to 190 C / Gas mark 5. Line a baking tray with parchment.
In a frying pan over medium heat, heat the butter and olive oil and add the sliced onions. Cook over medium heat, stirring occasionally, until caramelised, about 10 to 15 minutes.
Roll out the pizza dough to a .25cm thickness, either making 1 large pizza or several smaller ones if desired. Place the pizza base on the prepared baking tray and top first with the caramelised onions, then the pears and the crumbled Stilton. Sprinkle with pine nuts, if using. Season to taste with salt and pepper.
Bake in the preheated oven for 10 to 20 minutes, or until the base is crispy and the cheese melted.