Giant Sausage Roll - Cooking like a Boss

preheat oven 200*c							bake for 40 minutes
2 ¹⁄₂ 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
937 ¹⁄₂g ¹⁵⁄₁₆kg 2.07lb 33.1oz sausage meat
425g 0.425kg 0.937lb 15oz cheddar cheese	grated
5 tablespoons 0.075 l 75 ml 15 tsp 0.317 cup 0.132 pint tomato puree
10 sundried tomatoes	finely chopped
5 tablespoons 0.075 l 75 ml 15 tsp 0.317 cup 0.132 pint fresh breadcrumbs
2 ¹⁄₂ egg	beaten
800g ⁴⁄₅kg 1.76lb 28.2oz puff pastry sheet
milk