Giant Sausage Roll - Cooking like a Boss

preheat oven 200*c							bake for 40 minutes
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
187 ¹⁄₂g ³⁄₁₆kg 0.413lb 6.61oz sausage meat
85g 0.085kg 0.187lb 3oz cheddar cheese	grated
1 tablespoons 0.015 l 15 ml 3 tsp 0.063 cup 0.026 pint tomato puree
2 sundried tomatoes	finely chopped
1 tablespoons 0.015 l 15 ml 3 tsp 0.063 cup 0.026 pint fresh breadcrumbs
¹⁄₂ egg	beaten
160g 0.16kg 0.353lb 5.64oz puff pastry sheet
milk