Best Escarole & White Bean Soup Recipe - How to Make Escarole & White Bean Soup

Ingredients

• 1 tbsp. extra-virgin olive oil
• 1/2 onion, finely chopped 
• 2 stalks celery, finely chopped 
• 1 large leek, cleaned and thinly sliced (white and pale green parts only)
• 3 cloves garlic, minced  
• 2 tsp. freshly chopped thyme
• 1/2 tsp. red pepper flakes (optional
• 1 head escarole, roughly chopped 
• Kosher salt 
• Freshly ground black pepper
• 4 c. low-sodium vegetable or chicken broth 
• 2 c. water
• 2 (15-oz.) cans cannellini beans, drained and rinsed
• 1 Parmesan rind, or 1 (1-oz.) piece of Parmesan
• 2 bay leaves 
• Juice of 1 lemon 
• Freshly grated Parmesan, for serving