Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Toss chopped vegetables with olive oil, salt, pepper, thyme, and paprika.
Spread on the baking sheet and roast for 25–30 minutes, until tender and caramelized.
Transfer roasted vegetables to a large pot. Add tomato paste and vegetable broth. Simmer for 10 minutes.
Blend until smooth using an immersion blender or high-speed blender in batches.
Taste and adjust seasoning. Add lemon juice if desired. Thin with extra broth if needed.
Notes
Roast at high heat for caramelization. Use whole garlic for a mellow flavor. Add greens or coconut milk for variation. Don’t overcrowd the pan—browning matters.