Mussels with Harissa and Basil
Preheat oven to broil with oven rack in middle of oven. Rub bell pepper halves and 2 onion quarters with 1 teaspoon olive oil. (Reserve remaining onion quarters for another use.) Arrange bell pepper halves and onion quarters, cut sides down, on a rimmed baking sheet. Broil in preheated oven until bell peppers are well
