Braised Lamb Shanks with Summer Gremolata

Name: Braised Lamb Shanks with Summer Gremolata
Ingredients: 3 Tablespoons chopped fresh mint; 2 Tablespoons panko breadcrumbs; 2 Tablespoons finely grated lemon zest; 1 Tablespoon finely chopped parsley; 1 clove garlic, minced; 6 1- to 1½-pound lamb shanks; 4 cloves garlic, minced; 1½ Tablespoon tomato paste; 3 Cups chicken broth; 2 Cups finely chopped celery; 2 medium yellow onions, roughly chopped; Salt and pepper; All-purpose flour; Grapeseed oil; 3 Cups chopped carrots; 1 Cup dry white wine; 4-6 sprigs fresh Italian parsley; 4-6 sprigs fresh thyme; 3 bay leaves