Start with peeling and chopping up butternut squash, carrots, sweet potatoes into chunks. The bigger the chunks, the longer you will have to cook it. Medium size cubes work best.
Add splash of oil into deep pot and add finely chopped onion and garlic, let it simmer for couple of minutes until fragrant and toss in your roughly chopped vegetables and lentils. Pour over stock, cover and let it simmer for about 20-30 mins until the vegetables are soft.
Transfer into a blender or use immersion blender and blend until you have smooth creamy soup. Add couple of spoons of créme fraîche and give it good mix until everything incorporated. You can add dollop of créme fraîche, alongside chilli oil when serving.