Creamy Kale Gratin
CREAMY KALE GRATIN2 T. Kosher salt, more if needed6 T. butter, plus for baking dish½ c. chopped Vidalia onion2 whole cloves¼ c. flour2 c. whole milk1 ½ lbs. kale, rough chop½ c. plus 2 T. grated Parmigiano-Reggiano½ t. grated fresh…