Beef Sausage Rolls

(makes approx. 16)

300 g beef mince
1 small brown onion, finely chopped
1 carrot, peeled, grated
1 egg, lightly beaten
1 tblsp parsley leaves, chopped
1/2 tsp dried mixed herbs
1/2 tsp black pepper
2 sheets frozen puff pastry
1 tblsp milk