put oil or butter in seperate pan, gently cook garlic (no colour do not burn) 1-2 mins add the sherry, salt and pepper. add chicken stock cube dissolved in a cup of water, add tuna and mix, add salt and pepper to taste. simmer gently reducing by about half (6-7) mins, take off the heat slowly add the cream and then the parsley.
drain the spagetti and add to the sauce
this a runny sauce which can be mopped up with your fav bread!!