Easy Ribollita Soup Recipe

Ingredients

• 2 tablespoons extra-virgin olive oil
• 1 red onion
• 2 garlic cloves
• 1 3/4 cups (1 14-ounce tin) whole tomatoes
• 3 1/8 cups vegetable stock
• 1 1/3 cups cavolo nero, or kale
• 1 3/4 cups (1 14-ounce tin) cannellini beans
• 3 slices stale, good-quality white bread
• Sea salt flakes and freshly ground black pepper