– 2 teaspoons sea salt, divided – 1 pound mezzi rigatoni pasta – 3 tablespoons olive oil, divided – 1 pound smoked pork kielbasa sausage, sliced on a diagonal into ¼-inch-thick round – 1 small red onion, peeled and thinly sliced – 1 large yellow bell pepper, stem and seeds removed, thinly sliced into strip – 1 large clove garlic, minced – 2 cups grape tomatoes, halved lengthwise – ½ teaspoon freshly ground black pepper – ½ cup dry white wine – 2 tablespoons whole-grain mustard – 1 large bunch mustard greens, tough stalks removed and leaves torn into bite-sized piece – 8 ounces smoked mozzarella, cubed – ½ cup grated Pecorino Romano, for serving