Make your soup one of two ways:
1) Place roasted vegetables, maple syrup, and 1 cup vegetable stock in large pot. Use a submersion blender to blend until smooth, adding more vegetable stock as needed for desired consistency. Cook on medium low until heated through.
or…
2) Place roasted vegetables in blender/food processor and blend until creamy. Place blended mix and maple syrup in a large pot and stir in vegetable stock as needed for desired consistency. Cook on medium low until heated through.