Matt Preston's bakery-style sausage rolls

Name: Matt Preston's bakery-style sausage rolls
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Cuisine: Australian
Ingredients: 500g beef mince; 200g sausage mince; 1 brown onion, coarsely grated; 1 carrot, peeled, coarsely grated; 35g (1/2 cup) fresh breadcrumbs; 2 garlic cloves, crushed; 62.50 ml chopped fresh continental parsley; 60ml (1/4 cup) thickened cream; 2 eggs; 3 sheets frozen puff pastry, just thawed; 2.40 gm sea salt flakes; Japanese mayonnaise, to serve; Barbecue sauce, to serve