In this tasty Mediterranean dish, seared tuna steak is placed on top of a bed of white beans, collard greens, peppers, and bacon. Watch how to make atun at home. For this recipe you will need tuna, seasoned lightly with pepper, white bean cassoulet and garlic aloli. For the bean cassoulet you need white beans, bacon, collard greens and peppers. For the garlic aioli you need eggs, olive oil, garlic cloves, lemon juice, salt and pepper to taste.