Bloom the Spices : Warm the olive oil in the Dutch oven over medium heat. Add the smoked paprika and dried rosemary, stirring constantly for about 45 seconds until fragrant. This step awakens the flavors of the spices.
Build the Foundation : Add the chopped onion, carrots, celery, and diced sweet potato to the pot. Sauté for 8 to 10 minutes, stirring occasionally, until the vegetables begin to soften and the onion becomes translucent. Add the minced garlic and cook for one more minute until aromatic.
Deglaze and Combine : Stir in the sun-dried tomato paste, cooking for another minute to deepen its flavor. Pour in a splash of the vegetable broth to deglaze the pot, scraping up any browned bits from the bottom. Add the remaining broth, the can of crushed tomatoes, rinsed lentils, and the bay leaf.
Initial Simmer : Increase the heat to bring the soup to a gentle boil. Once boiling, reduce the heat to low, cover the pot, and let it simmer for 30 minutes. This allows the lentils and hard vegetables to become tender.
Add the Greens & Veggies : Stir the chopped Swiss chard stems and the frozen peas into the soup. Continue to simmer, covered, for 5 minutes. Next, add the Swiss chard leaves and diced zucchini. Allow the soup to cook for another 5 to 7 minutes, or until the zucchini is tender-crisp and the chard has wilted completely.
Final Seasoning : Remove the pot from the heat and discard the bay leaf. Stir in the kosher salt and black pepper. Taste the soup and adjust the seasoning if necessary. Let it rest for a few minutes before ladling into bowls to serve.