Giant Sausage Roll - Cooking like a Boss

preheat oven 200*c							bake for 40 minutes
2 large onion	chopped	mash together in a bowl	lay meat along centre	seal pastry into giant sausage roll shape	flip so join is on bottom	slice air vents in top
750g ³⁄₄kg 1.65lb 26.5oz sausage meat
340g 0.34kg 0.75lb 12oz cheddar cheese	grated
4 tablespoons 0.06 l 60 ml 12 tsp 0.254 cup 0.106 pint tomato puree
8 sundried tomatoes	finely chopped
4 tablespoons 0.06 l 60 ml 12 tsp 0.254 cup 0.106 pint fresh breadcrumbs
2 egg	beaten
640g 0.64kg 1.41lb 22.6oz puff pastry sheet
milk