The chicken soup can be prepared through Step 5 up to 1 day ahead. Refrigerate the shredded chicken and broth separately. Keep the fried tortilla strips in an airtight container.
Winter tomatoes are often cottony and flavorless, but they will ripen a bit if left out at room temperature for a few days. If you can, plan ahead and buy the tomatoes 2 to 3 days in advance of making this recipe. You could also substitute a pound and a half of cherry tomatoes, which are tasty all year. When roasting the smaller tomatoes, check them after 10 minutes. They will blacken faster than the regular tomatoes.
The acidic, citrusy notes in this soup call for a dry Australian Riesling with matching citrusy flavors.