Winter Vegetable Shepherds Pie

Name: Winter-Vegetable Shepherd's Pie
Ingredients: 2 cups diced parsnips; 2 cups diced carrots; 1 cup diced yellow beets; 1 cup diced rutabaga; 12 pearl onions, peeled; 6 cloves roasted garlic (see below); 3 cups chopped Swiss chard stems and leaves; 1 teaspoon minced fresh tarragon; 1 teaspoon minced flat-leaf parsley; Coarse salt and freshly ground black pepper; 6 tablespoon unsalted butter, melted; 2 cups chicken broth; 4 cups mashed potatoes; 1/4 cup fresh breadcrumbs; 1 whole head or 6 cloves of garlic