For a vegan version, omit the table cream or crème fraîche or substitute with a plant-based cream alternative. Roasting the vegetables brings out their natural sweetness and adds depth of flavor to the soup. Don't skip this step! Adjust the amount of mint according to your preference. Start with 1/4 cup and add more if desired after blending. If you don't have a high-speed blender, you can use an immersion blender directly in the pot. Just be careful to avoid splattering. The soup can be made a day or two in advance, allowing the flavors to meld even further.