Creamy white bean soup with escarole and gremolata

Name: Creamy white bean soup with escarole and gremolata
Prep time: 25 min
Cook time: 35 min
Total time: 1 h
Cuisine: Mediterranean, European
Ingredients: 1 large Onion (peeled and diced); 2 medium Carrots (peeled and diced); 6 cloves Garlic (peeled and minced); 3 Celery stalks (diced); 1 Potatoes (cubed); 1 Peeled Tomato (cubed); 1 liter good quality vegetable broth; 4 cups Cannellini beans (cooked); 2 heads of escarole (washed and roughly chopped); ¼ teaspoon red chili pepper flakes (optional); 1 teaspoon Herbes de Provence seasonings; 1 teaspoon Salt; ¼ teaspoon ground black pepper (to taste); Juice of a lemon (optional); ½ cup Fresh Parsley (finely chopped); 4 cloves of garlic (grated); Lemon zest from 2 lemons; Salt to taste