Stewed Great Northern Beans

Name: Stewed Great Northern Beans
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: American
Ingredients: 2 tablespoons unsalted butter; 3 cups shredded kale (about 3 ounces); 2 medium roma tomatoes (cored and diced); 1 medium shallot (diced); 1 medium yellow squash (sliced into matchstick strips); 1/2 teaspoon kosher salt; 3 cloves garlic (grated; see note #1); 2 tablespoons tomato paste; 1/2 teaspoon dry thyme; 15.5 ounce can great northern beans (drained and rinsed); 1/2 to 1 cup vegetable broth (I recommend Better than Bouillon, see note #2); 1 tablespoon sherry cooking vinegar; freshly ground black pepper (to taste)