Broiler Sausage, Peppers and Onions with Pepper Relish

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4 Italian sausage links, both sweet and hot

1 pound assorted peppers, such as Italian long hots, mini sweet peppers and bell peppers

1 pound assorted onions, such as scallions, red onions, shallots and cippolini

1/4 cup plus 2 tablespoons extra-virgin olive oil

Kosher salt and freshly ground black pepper

1/4 cup stemmed, finely chopped pepperoncini, plus 1 teaspoon pepperoncini brine

1/4 cup finely chopped fire-roasted red peppers

1 tablespoon whole-grain mustard

1 tablespoon finely chopped flat-leaf parsley

Pinch of sugar

Crusty bread or white rice, for serving, optional