Ingredients:

• 2 tablespoons extra virgin olive oil
• 1/2 pound bulk sweet or spicy Italian sausage
• 1 onion, sliced thin (about 1 1/2 cups sliced onions)
• 2 large cloves garlic, sliced thin
• 1 pound kale (1 large bunch), stemmed and roughly chopped
• 1/2 cup chicken or vegetable stock
• 1 (15-ounce) can white beans, rinsed and drained, or 1 1/2 cups cooked white beans
• Salt and pepper
• Splash of vinegar (cider, red wine, or sherry vinegar)