Peel and dice the bottle gourd, trim and slice drumstick pods, and chop the onion, carrot, and potato.

Heat 1 tablespoon of olive oil or ghee in a large pot over medium heat. Add cumin seeds and toast until fragrant.

Add the chopped onion and cook until translucent, about 4-5 minutes. Stir in the garlic and ginger and sauté for another minute.

Add turmeric and black pepper, then toss in the diced carrot, potato (if using), bottle gourd, and drumstick pieces. Sauté for 3-4 minutes to combine flavors.

Pour in 4 cups of stock, bring to a boil, then reduce heat to a simmer. Cover and cook for 20-25 minutes, until vegetables are tender and drumsticks are cooked through.

Use an immersion blender to lightly purée the soup for a silky texture, or leave it chunky if preferred. For a completely smooth soup, transfer to a blender in batches and blend until smooth.

Adjust seasoning with salt and extra pepper or lemon juice for brightness. Ladle into bowls and garnish with fresh cilantro or parsley. Serve with lemon wedges on the side.