Heat 1 tbsp vegetable oil in a large saucepan over medium heat until hot.
Add the diced onion and sauté, stirring occasionally, until soft and translucent, about 5–7 minutes.
Add the sliced carrots, diced potato, 1 tsp ground coriander and ½ tsp paprika; stir for 1–2 minutes to coat the vegetables in the spices.
Pour in 1 litre vegetable stock, stir to combine, and bring to a boil.
Reduce heat to medium, cover with a lid, and simmer for about 30 minutes, or until the carrots and potatoes are very tender.
Add the bunch of fresh coriander (leaves and stalks) to the pot.
Blend the soup until smooth using an immersion blender, or transfer in batches to a countertop blender (allowing hot soup to cool slightly and venting the blender lid). Return blended soup to the pot.
Season to taste with salt and ground black pepper, reheat briefly if needed, and serve.
Notes
Garnish with extra coriander leaves, and/or swirls of cream.