Vegetarian Green Borscht (Spinach Soup)

Name: Vegetarian Green Borscht (Spinach Soup)
Cuisine: Eastern European
Ingredients: 2 tbsp olive oil; 5 medium yellow potatoes (cubed); 3 - 5 carrots (scrubbed and sliced); 3 - 5 stalks carrot tops (optional) (cleaned ); 2 parsnips (optional) (sliced ); 2 celery stalks (cut in half ); 1/4 cup celeriac root (optional) (peeled and cubed ); 3-5 whole parsley (stems and leaves ); 8 cups water; 2 tbsp salt; 1 tsp pepper; 1 bunch or clamshell spinach (chopped); 3 scallions (sliced into thin circles); 3 eggs (hard-boiled and diced); ½ lemon (juiced); 1/4 cup dill (chopped ); sour cream (for serving )