6 large beef short ribs about 14 to 16 ounces each
1 tablespoon thyme leaves plus 1 teaspoon, and 4 whole sprigs thyme
1 tablespoon freshly cracked black pepper
3 dozen small pearl onions
1/2 cup extra-virgin olive oil
2 tablespoons balsamic vinegar
2 1/2 cups hearty red wine
6 cups beef or veal stock
4 sprigs flat-leaf parsley
2 bunches Swiss chard cleaned, center ribs removed
Kosher salt and freshly ground black pepper
1 tablespoon prepared horseradish
2 pounds potatoes scrubbed
8 tablespoons unsalted butter melted
1 cup half-and-half warmed
1 1/2 teaspoons table salt
chives for garnish (optional)