First, toast one side of two slices of bread under the grill.
Turn them over and thinly spread tomato puree over the untoasted side.
Place half a slice of ham on each bread slice, over the tomato puree.
Finely slice one mushroom and spread evenly over the ham.
Repeat with about a third of an onion.
Cover everything with cheese, as much as you like.
Turn down the grill and toast slowly, until browned.
Eat and enjoy!
Other ingredients that work well include; peppers, cooked sausage or chicken, spring onion, celery or olives.
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