Rinse the lentils thoroughly under cold water until the water runs clear. This step ensures the soup will have a smooth, clean texture.
Cook the base
In a large pot, combine the rinsed lentils, cubed onion, carrot, and potato. Add 12 cups of water, filling the pot approximately three-quarters full. Bring the mixture to a boil, then reduce the heat to low and simmer for 45 minutes to 1 hour, or until the lentils and vegetables are fully softened.
Blend the soup
Once cooked, allow the soup to rest for 10 minutes. Remove any excess water if necessary and set it aside to adjust the consistency later. Blend the soup using a hand blender or a standard blender until it achieves a creamy consistency. If using a standard blender, allow the soup to cool slightly to avoid splashing.
Incorporate the spices and parsley
Return the blended soup to the pot. Stir in the cumin, black pepper, salt, and optional 7-spice blend. Add the freshly chopped parsley for a burst of flavor. Simmer the soup over low heat for an additional 10–15 minutes, stirring occasionally.
Add the lemon juice
Remove the pot from heat and stir in the freshly squeezed lemon juice. Adjust the quantity based on personal preference for tanginess.
Serve and garnish
Ladle the soup into bowls and garnish with fried pita pieces, caramelized onions, or an extra sprinkle of parsley. Serve immediately and enjoy.
Notes
To make this recipe gluten-free, omit the fried pita bread topping or use gluten-free pita alternatives. Ensure all spices, particularly the 7-spice blend, are gluten-free by checking the packaging.