Slice them how you want them. Cook over a medium heat in some butter with the lid on the pan for a few minutes until soft. Delicious! Nice with a bit of crushed garlic as well.
Just thickly slice them and lightly saut� them in olive oil.
I am slightly perplexed here... why on earth would you want to replicate the tinned variety - they are horrible compared (in taste) to fresh mushrooms !