Branzino With White Wine and Sautéed Leeks
2 lbs branzino or sea bass fillets, cut into4-inch pieces1 tablespoon kosher salt1/4 cup extra-virgin olive oil1 large leek, finely sliced6 garlic cloves, chopped1 orange pepper, chopped into long slivers10 ounces cherry tomatoes, cut in half1/2 cup white wine1 cup vegetable broth or water2 teaspoons mustard powder2 cups petite green peas1 lemon, thinly sliced1/2 teaspoon…