
½ cup unsalted butter, room temperature
¼ cup chopped fresh rosemary, plus additional for garnish
¼ cup chopped fresh thyme, plus additional for garnish
6 cloves garlic, minced
1 tablespoon plus ½ teaspoon flaky sea salt, plus additional for garnish
1 tablespoon plus 1 teaspoon cracked black peppercorns, plus additional for garnish
1 (5-pound) boneless beef ribeye roast
1 pound baby Dutch yellow potatoes
2½ tablespoons olive oil, divided
2 bulbs garlic, halved crosswise