Autumn is a great time to stay cosy indoors and bake, but you do not need a complicated recipe or a long shopping list of ingredients to make something tasty. Mary Berry’s open apple pie only needs ...

1. Place 350g plain flour in a bowl. Cut 175g hard block margarine into cubes; add to the flour. 2. Using your fingertips, rub the fat and flour together until you have incorporated all the flour. 3.