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: European, Italian, Mediterranean
Ingredients: 1 Onion (large, peeled and diced); 2 Carrots (medium, peeled and diced); 6 cloves Garlic (peeled and minced); 3 Celery stalks (diced); 1 Potatoes (cubed); 1 Tomatos (peeled, cubed); 1 liter Vegetable broth (good quality ); 4 cups Cannellini beans (cooked); 2 heads Escarole (washed and roughly chopped); ¼ teaspoon Red chili pepper flakes (optional); 1 teaspoon Herbes de Provence seasonings; 1 teaspoon Salt; ¼ teaspoon Black pepper (ground, to taste); Lemon juice (optional, to taste); ½ cup Parsley (fresh, finely chopped); 4 cloves Garlic (grated); Lemon zest (from 2 lemons); Salt (to taste)