BLENDER:
Place roasted veggies, 3 cups of stock and bouillon cubes into a blender. (You may need to work in batches of two or three depending on the size of your blender.) Blend until smooth. Be careful with the steam that may lift out from the center of the lid. Transfer soup into a pot and warm over medium heat to serve. (Check thickness and add remaining stock, if needed, to thin It out.)