Kale with Blue Cheese Gratin (1) Saute 3 bunches of Kale with an onion and garlic and set to the side (2) Make roux: heat 4 tablespoons oil/butter and 4 tablespoons flour, whisk in 1 cup of milk and 1 cup broth. Add 1/4 to 1/2 cup blue cheese. Melt into sauce. (3) Put sautéed kale/onion in a casserole dish. Pour sauce on top. (4) Mix 1/2 cup of bread crumbs with a drizzle of olive oil. Top casserole with breadcrumbs. (5) Bake gratin at 350 for 10 minutes