Step 1 Preheat oven to 220C/200C fan-forced. Line 2 large baking trays with baking paper.
Step 2 Heat oil in a large frying pan over medium heat. Add onion. Cook, stirring occasionally, for 15 minutes or until onion is golden and softened. Add sugar. Stir well. Remove from heat.
Step 3 Make pizza dough. Combine flour, yeast and sugar in a bowl. Season with salt and pepper. Make a well. Add oil and warm water. Mix well to form a soft, sticky dough. Turn dough out onto a lightly floured surface. Knead gently until dough comes together. Divide into 4 equal portions. Roll out 1 portion to form an 11cm x 21cm oval shape. Place on 1 prepared tray. Repeat with remaining dough, placing 2 ovals on each tray.
Step 4 Spread each pizza with hummus, then drizzle with barbecue sauce. Sprinkle with 1/3 cup of the pizza cheese. Top with caramelised onion. Squeeze sausage meat from casings. Roll into 1cm balls and arrange on pizzas. Top with peppers. Sprinkle with remaining pizza cheese and top with pine nuts. Season with salt and pepper.
Step 5 Bake pizzas for 15 minutes or until bases are golden and sausage is cooked through. Serve pizzas topped with parsley.