In a soup pot, heat the oil over medium-high heat. Stir in the carrot, celery, onion, 1 teaspoon of the salt, and the pepper and cook until softened, stirring frequently, about 5 minutes. Stir in the zucchini and garlic and cook for another 1 minute.
2
Add beans and tomatoes; simmer
Add the beans, stock, canned tomatoes and their liquid, and remaining 1½ teaspoons salt. If using whole plum tomatoes, break them up with kitchen shears or squish them in your hands before adding them to the pot. Bring the mixture to a simmer, then cover the pot and reduce the heat to low. Simmer until the vegetables are tender, 20 to 30 minutes.
3
Cook corn and orzo
Stir in the corn and orzo, then return to a simmer. Cook until the orzo is nearly tender, 10 to 12 minutes. Taste and add salt if needed.
4
Mix cherry tomatoes with pesto
While the soup is simmering, in a medium bowl, toss together the cherry tomatoes and pesto.
5
Add tomatoes and pesto to soup
When the orzo is almost tender, add the tomatoes and pesto to the pot and simmer for 1 to 2 minutes longer to heat the tomatoes through and finish cooking the orzo.
6
Serve soup with toppings
Remove from heat and ladle soup into bowls. Serve drizzled with a little more olive oil and topped with more pesto, grated Parmesan, torn fresh basil leaves, and lots of black pepper.
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