1. Roast peppers over a gas burner until lightly charred on all sides. Transfer to a bowl, cover with plastic wrap; let sit until cool enough to handle. Rub off the charred skin using a paper towel. Remove stem, seeds, and ribs, and cut into 1/2-inchthick strips.

2. Slice rolls in half; spread bottoms with tomato jam. Layer with arugula, mozzarella, and peppers; top with other half of roll.