Yay! I love it when I hear things like this. At our house a green vegetable is always served with dinner, and half the time it’s some sort of green like chard, kale, spinach, mustard greens, or collards. It’s my not-so-secret mission in my heart of hearts to convert everyone to loving their greens. Of course, it’s hard to go wrong when you mix kale with Italian sausage and white beans. But, baby steps people. Baby steps. Cook for 3 to 4 minutes, until the sausage is mostly cooked. Remove with a slotted spoon to a bowl. Return the sausage to the pan with the onions. Cover the pot again and lower the heat to low. Cook another 5 minutes, then turn off the heat. Let stand 5 minutes, sprinkle with a splash of vinegar and serve.
