This has been a favourite of mine for day trips for some years.  Make the spegg salad the night before so it is nice and cold from the fridge.

 

I use 10 large eggs and 3/4 of a medium white onion.  Boil the eggs as for egg salad, once boiled mash with a potatoe masher...add butter while you mash for flavour and texture.  Mix in the diced onion and add mayonaise as you would normaly

 

In another bowl mash a can of spam.  Add the mashed spam to the egg salad and mix in well

 

Cover and put in fridge to cool.  I like this spegg salad with a slice of cheese in the sandwich. 

 

bigguy