Corned Beef and Cabbage

Name: Corned Beef and Cabbage
Ingredients: 1 (4-pound) corned beef brisket, preferably center cut, brine and seasoning packet discarded; 4 (5-inch) thyme sprigs; 2 teaspoons whole coriander seeds; 3 dried bay leaves; 1 small (about 2 pounds) head green cabbage, cut into 3-inch wedges, leaving core intact; 1 1/2 pounds baby gold potatoes, scrubbed, halved lengthwise if large; 6 medium (2 ounces each) carrots, peeled, halved crosswise diagonally, and halved lengthwise, if large; 3 medium (4 ounces each) purple-top turnips, peeled and cut into eighths; 2 teaspoons kosher salt, divided; 3/4 teaspoon black pepper, divided; 1/2 cup sour cream; 2 tablespoons finely chopped fresh flat-leaf parsley, plus more for garnish; 2 tablespoons whole-grain mustard; 1 tablespoon country Dijon mustard; 1 1/2 teaspoons Worcestershire sauce