Preheat a skillet over medium heat on your campfire grate (or camp stove).
Add the bratwurst and cook them through. Remove the sausages from the pan and set them aside.
Then the onions, peppers, salt, and black pepper. Cook for a few minutes until they just begin to soften, then add the crushed pineapple.
Return the bratwurst, nestling them into the vegetables so they come in contact with the skillet. cook until the pineapple is evaporated.
Remove from the heat and arrange the brats and veggies among the sandwich rolls.
Top with the sriracha mayonnaise and enjoy!