Preheat your oven to 450°F, and line a baking sheet with aluminum foil. Spread the tomato halves and onion quarters out evenly on the foil. Roast for 15 minutes, or until they're softened and slightly blackened.
Add the tomatoes, onions, and garlic cloves to a blender and mix on high until smooth. Prepare 6 cups of vegetable broth (we use bouillon cubes, but pre-mixed stock also works). Set both aside.
Heat olive oil over medium in a large stockpot. Add the dry shell pasta in and toast, stirring constantly, for 2-3 minutes, or until fragrant. Remove from the pot.
Add the carrots and celery in and sauté for another 2-3 minutes. Transfer the pasta shells back in along with the salsa mixture.
Lastly, add the vegetable broth and cilantro sprigs, bringing the soup to a boil. Cover and reduce the heat to simmer for 7-8 minutes, or until the pasta is al dente.
Season with salt and pepper to taste, then serve your soup immediately with your favorite garnishes. Happy eating!
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Notes
Keep it simple: For an even quicker, easier recipe, leave out the extra vegetables.
Don’t skip the toasting: Frying the pasta in a touch of oil imparts nutty, toasted flavors. It’s the key to a well-rounded Mexican sopita!
Make the broth from scratch: In order to create the most vibrant sopa de conchas, you really need to make your own tomato broth! You can use a store-bought version, but it doesn’t compare.
Cut the vegetables small: For even cooking, cut the vegetables into small chunks of a similar size.
Nutritional information is a rough estimate and should not be taken as health advice.