Not just any sandwich, though, the best sandwich.
First, butter your bread. This step is essential, don't try to tell me you don't like butter or whatever, you're a liar and you know it. Butter's delicious. Butter both sides. Really slather it on.
Next, chop up some avocado. Some people like to squish it up and spread it over their bread in a thin layer that you can't even taste. Those people are wrong. And if you even think about arguing that you don't need to spread butter on there because the avocado makes up for it, just leave now.
Next slice a gherkin¹ into thirds, lengthwise and then cut the slices in half the other way. If you like, you can do a second one as well. Sometimes I do, sometimes, I just go with one, as illustrated here.
This next step is optional, and I often don't bother with it, and also there are a few different choices you can go with. And I know there will be some of you who will think this part is totally unnecessary, so feel free to skip it.
That warning out of the way, here are your choices. You can use lettuce, baby spinach, or a green salad mix. I know, it's a bunch of leaves, and that seems like a terrible thing to put in a sandwich, but consider this: Popeye likes spinach, and he seems pretty cool. I would have used spinach here but the supermarket didn't have any, so I got a bag of mixed leaves, which does include some spinach.
Once you've made you leaf-choice, squirt some mayonnaise on top. If you don't have squirty mayonnaise you'll need to spread it on the other slice of bread.
Then put some cheese on the other slice. You may think this will cause problems later, but don't panic, I have a plan. That cheese will stay right where we want it.
While the grill's heating up and the cheese is melting, slice up some tomato and whack that on top of the salami, then when your kettle's boiled you can make the tea, and once you're done with that it should be time to take the cheesy bread out of the grill.
At this point your should have just enough time to pour the tea before the second side has finished toasting.
¹ For any Americans reading, I believe you call gherkins "pickles", but who really knows with you people.
² Again for Americans, I believe you refer to grills as "broilers" for some reason. Learn English.