Preheat your oven to 200°C (400°F). Line a baking sheet with parchment paper.
Peel and chop the sweet potatoes and carrots into even-sized chunks for uniform roasting.
Toss the chopped vegetables with a tablespoon of olive oil, salt, and pepper until evenly coated.
Spread the vegetables on the prepared baking sheet in a single layer and roast for 25-30 minutes, or until they are golden and fragrant.
While the vegetables roast, peel and mince the fresh ginger.
In a large pot, heat a tablespoon of oil over medium heat, then add the minced ginger and cook until fragrant, about 1 minute.
Add the roasted sweet potatoes and carrots to the pot, then pour in the vegetable broth. Bring to a gentle simmer.
Simmer for 10 minutes to allow flavors to meld and vegetables to soften further.
Use an immersion blender or transfer the soup to a blender to puree until smooth and velvety.
Taste the soup and adjust the seasoning with additional salt, pepper, or a squeeze of lemon for brightness.
Serve hot, garnished with herbs or a drizzle of cream, if desired, for extra richness.