Mum's Salmon Casserole

Mum put (economical - serves 6) for this one.  My sister made it for my oldest brother this year because it was his favourite.  And there were always some left over chips in the packet.  I seem to remember potato straws being used for a while.

16 ounce can salmon
2 medium sized onions sliced
1 large packet potato chips
1 pound sliced tomatoes
4 ounces grated tasty cheese
2 cups cooked rice
salt & pepper

Drain liquid from salmon and keep
Place alternate layers of:
salmon, onion, tomato and rice in a large cassole dish, seasoning each layer to taste.
Pour salmon liquid over the top and cook in a moderate oven for 30 minutes.

Just before serving, spread thickly with the grated cheese and crushed potato chips and return to oven for a few minutes.
Serve with salad and crisps.