Preheat oven to 400F.
Chop your carrots and cauliflower into bite-sized pieces and place on a baking sheet. Drizzle with 1 tablespoon of oil and sprinkle with salt. Roast for 25 minutes or until fork-tender.
Meanwhile, heat 1 tablespoon of oil in a medium saucepan over medium heat. Place the onions, garlic and ginger and cook for 5 minutes or until fragrant.
Add the curry, cumin and salt and cook for an additional minute, then add the broth and lentils.
Bring to a boil, then reduce heat to low and simmer for 15 minutes, covered.
When the vegetables are done roasting, transfer to a blender, along with the content of the saucepan and 1 cup of coconut milk. Blend until smooth. Alternatively, transfer the vegetables to the saucepan along with the other ingredients and coconut milk. Bend everything together using an immersion blender.
Bring the mixture back to the saucepan (if using the blender). Cook a few more minutes until heated through.
Taste and add salt and pepper to taste.