What makes a killer sandwich?

Prosciutto

A genetic predisposition to violence coupled with the wrong environment growing up.

Ur mom making it for me

Golden dart grenouille between 2 slices of incorrectly prepared puffer fish.

Boom.

lotsa things can make a great sandwich but addin mayonnaise ruins it instantly

Potato bread, turkey meat, pepper jack cheese, lettuce, tomato, miracle whip, and some chips on the side.

Canadian bacon, leaf lettuce and tomato on whole grain bread with 1000 Islam dressing.

Grilled rye.

Cheese, man sides meat balls and homemade seaman sauce

Heat?

Fresh veggies and sub bread

Great fresh bread. Obviously!

Depends on the sandwich! But I would say a good sauce for sure, as well as plenty of good veggies. If I'm just making a regular much meat sandwich at home, I usually like mustard and olive oil, as well as lettuce, onion, and tomato. For a burger, I like all of the works except for mayo (unless it's only a little bit, but if it gushes out of the sides, that's disgusting). Garlic butter on a burger is amazing as well! Also, real cheese instead of that nasty processed crap that tastes like plastic, is much better.

If it has ingredients like bacon, mozzarella, chicken and whatnot and of course seasonings.

They are what makes sandwiches less bland tasting and boring looking.

Sometimes with killer sandwiches you can use spices not just seasonings.

Best thing to use in your killer sandwich is caramelised red onions ( depends what sandwich you're trying to make but it goes well on burgers )

Cyanide.