I love making pizza sandwiches without pie irons. We use the grill at camp. Butter the bread and then fill them with sauce, cheese and toppings. They are fast and easy to make.
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We also put them on the grill on the griddle pan though. This way it's just like a frying pan. I also tried to make them with a pie iron. It does not always work though, sometimes they burn!
I'm a huge fan of pizza and so are the kids so it is a must-have every camping trip we take. Heck we even make the pie iron pizzas out back on the campfire.