Two-Bean Soup with Kale

INGREDIENTS

• 3 tablespoons olive oil
• 1 cup chopped onion
• 1/2 cup chopped carrot
• 1/2 cup chopped celery
• 1/2 teaspoon salt, divided
• 2 garlic cloves, minced
• 4 cups organic vegetable broth (such as Emeril's), divided
• 7 cups stemmed, chopped kale (about 1 bunch)
• 2 (15-ounce) cans no-salt-added cannellini beans, rinsed, drained, and divided
• 1 (15-ounce) can no-salt-added black beans, rinsed and drained
• 1/2 teaspoon freshly ground black pepper
• 1 tablespoon red wine vinegar
• 1 teaspoon chopped fresh rosemary