3 slices of bread
Butter the 3 slices of bread
Place frist slice in pan on stove set to medium low heat
Put cheese on bread and cover for a few minutes, until cheese is melted.
Once cheese is melted, or if you've peaked at the underside of the slice of bread and you know its time to flip it before it burns :)
put the second slice of bread on the cheese, butter side up, and then flip it
Next you put the mayo on either the third slice of bread, or on the cooked first slice you just flipped.
(if you put it on the thrid slice, you'll get butter on your hand, if you put it on the one in the pan, it might be tricky, its up to you.
Add black pepper after the mayo
Then put the tomato down on the bread
Put the last slice of bread on and flip it to finish it off.
There doesn't need to be any more cooking, so you'll just have to finish grilling the bread, nice and golden brown.
Refer to my cooking video on youtube below.
Video recipe of grilled cheese and tomato on youtube