1.   Brush the cut surfaces with the lemon juice to help prevent discolouration.

2.   Meanwhile, place the half onion in a dry frying pan and allow the cut surface to burn.

3.   The cut surface was firm and pale, but with no areas of necrosis.

4.   The cut surface of the lung is mottled and reddish-purple.

5.   After a half hour, brush with oil and grill until it is tender and the cut surfaces are brown.

6.   But you can retard spoilage a little longer by coating cut surfaces with petroleum jelly or lemon juice.

7.   Cut directly below a node to help callus the cut surface.

8.   Place on a square of foil and drizzle the cut surface with oil.

9.   Rub the inside of the pot with cut surface of garlic.

10.   Rub the cut surface with some lemon juice to keep it from discoloring.