To prepare the soup, slice yellow tomatoes into ½” slices and place on a baking sheet lined with parchment paper (or sprayed with non-stick cooking spray). Leave room between slices to prevent over-crowding. Sprinkle with salt, pepper and garlic powder.
Place baking sheet in the oven and roast approximately 2 hours or until the tomatoes are browned around the edges.
For Version 1 – wash and pat radishes dry before slicing into thin pieces. Place on a lined baking sheet and sprinkle with salt and pepper. Place in the oven with the tomatoes to save time, but be sure to check on them frequently because they will brown up much faster than the larger tomatoes.
For best results, use a Mandoline slicer to achieve even thickness. Roast until slightly browned and crispy. Reserve to garnish finished soup.
For Version 2 – remove crust from 2 slices of sourdough bread. Cut each slice into 4 equal-sized rectangles and brush one side with melted butter. Place buttered side down on a heated grill pan until browned grill marks appear. Remove from heat and flip each piece of sourdough over so the grill marks are facing up and top with a slice of Brie.
Place grill pan under a broiler right before you’re ready to serve the soup and heat for approximately 2 minutes, or until the Brie is soft and starting to melt. Don’t leave under too long or all the Brie will run off the bread base.
Finish Making the Soup:
Once tomatoes are done roasting, remove from oven and cool slightly. Add roasted tomato slices to high-powered blender or food-processor, along with stock, basil, onion, celery, garlic, cumin, warmed heavy cream (warmed to prevent curdling), salt and pepper. Blend on high until smooth and thoroughly combined. Taste and adjust seasonings as needed. If desired, add additional chicken or vegetable stock, 1 tablespoon at a time, and re-blend to achieve desired consistency.
To serve, top with either roasted radishes or the grilled cheese croutons and sprig of fresh basil. Enjoy!