2 carrots peeled, cut into 2 1/2-in. lengths and quartered
2 parsnips peeled, cut into 2 1/2-in. lengths and quartered
2 medium turnips, peeled and cut into eighths
1 large Yukon potato, peeled and cut into eighths
1 large sweet potato or yam, peeled and cut into eighths
4 shallots, peeled and halved
4 garlic cloves, peeled and halved
1 sprig rosemary, coarsely chopped
2 Tbsp. fresh parsley, chopped
2 sprigs fresh thyme, coarsely chopped
4 Tbsp. olive oil
1 Tbsp. unsalted butter, melted
salt and freshly ground pepper