Herbed Leg of Lamb with Olive Butter and Roasted Tomatoes

Name: Herbed Leg of Lamb with Olive Butter and Roasted Tomatoes
Ingredients: 1/3 cup coarsely chopped shallots; 1/2 cup crushed garlic cloves; 1/3 cup each thyme leaves, parsley leaves and chopped rosemary; 3 tablespoons Dijon mustard; 1/3 cup plus 1/4 cup extra-virgin olive oil; 1 stick plus 2 tablespoons unsalted butter, at room temperature; One 5-pound well-trimmed boned and butterflied leg of lamb; Kosher salt; Pepper; 2 pounds cherry tomatoes; 2 thyme sprigs; Chunky olive butter , for serving