Pumpkin Parsley Root and Thyme Soup

Name: Pumpkin, Parsley Root and Thyme Soup
Ingredients: 1 small pumpkin (like in the picture, about 500gr); 1,5L chicken or vegetable stock; 1½ teaspoons salt; 1 onion, chopped; 1 small potato; 2 sprigs fresh thyme, stems removed; 1 clove garlic, minced; 1 teaspoons Chili flakes; 5 parsley roots (if you can't find it, you can leave it out or use some leftover celeriac)