This chard and spinach soup gets complex flavor from slowly cooked onions and lemon juice, while a sprinkle of rice gives it body and a velvety texture. Serve with a swirl of fruity, fragrant extra-virgin olive oil for richness.
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2 tablespoons extra-virgin olive oil, plus more for garnish
2 large yellow onions, chopped
1 teaspoon salt, divided
2 tablespoons plus 3 cups water, divided
¼ cup arborio rice
1 bunch green chard (about 1 pound)
14 cups gently packed spinach (about 12 ounces), any tough stems trimmed
4 cups vegetable broth, store-bought or homemade
Big pinch of cayenne pepper
1 tablespoon lemon juice, or more to taste
Heat 2 tablespoons oil in a large skillet over high heat. Add onions and 1/4 teaspoon salt; cook, stirring frequently, until the onions begin to brown, about 5 minutes. Reduce the heat to low, add 2 tablespoons water and cover. Cook, stirring frequently until the pan cools down, and then occasionally, always covering the pan again, until the onions are greatly reduced and have a deep caramel color, 25 to 30 minutes.
Meanwhile, combine the remaining 3 cups water and 3/4 teaspoon salt in a soup pot or Dutch oven; add rice. Bring to a boil. Reduce heat to maintain a simmer, cover and cook for 15 minutes. Trim the white ribs out of the chard (save for another use, such as to add to a stir-fry or other soup). Coarsely chop the chard greens and spinach.
When the rice has cooked for 15 minutes, stir in the chard greens. Return to a simmer; cover and cook for 10 minutes. When the onions are caramelized, stir a little of the simmering liquid into them; add them to the rice along with the spinach, broth and cayenne. Return to a simmer, cover and cook, stirring once, until the spinach is tender but still bright green, about 5 minutes more.
Puree the soup in the pot with an immersion blender until perfectly smooth or in a regular blender in batches (return it to the pot). Stir in 1 tablespoon lemon juice. Taste and add more lemon juice, if desired. Garnish each bowl of soup with a drizzle of olive oil.
To make ahead: Prepare through Step 4 (omitting the lemon), cover and refrigerate for up to 3 days. Season with lemon just before serving.
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Serving Size: 1 3/4 cups
Per Serving: 95 calories; protein 3 g carbohydrates 13.3 g; dietary fiber 3.1 g; sugars 3.4 g; fat 3.8 g; saturated fat 0.6 g; vitamin a i u 7461. 9 I U; vitamin c 32.5 mg; fol-ate 98 meg; calcium 92.7 mg; iron 2.5 mg; magnesium 84.3 mg; potassium 510.1 mg; sodium 446.7 mg; thiamine 0.1 mg.