Creamy Cauliflower Soup with Rosemary Olive Oil

Directions

1. Make the rosemary oil: In a medium skillet, combine the olive oil and rosemary sprigs. Cook over low heat for 5 minutes, lowering the heat if the oil reaches a full simmer. (You want to cook it at a very gentle simmer to avoid frying the rosemary.) Carefully pour the oil and rosemary into a small bowl. Allow the rosemary to cool completely in the oil while you make the soup.
   

2. Make the soup: In a heavy pot, heat 2 tablespoons olive oil over medium-low. Add the onion and cook, stirring occasionally, until tender and translucent, 6 to 8 minutes. Add the garlic and cook until fragrant, about 30 seconds. (Be careful not to let the garlic scorch.)
   

3. Add the stock, cauliflower, salt and pepper, and bring to a boil over high. Lower the heat, cover, and simmer until the cauliflower is tender when pierced with a fork, about 10 minutes.
   

4. Strain and discard the rosemary stems from the rosemary oil. Working in batches if necessary, carefully transfer the vegetables, stock and 1/4 cup rosemary oil to a blender and blend on high until creamy. Add more rosemary oil to taste, and blend to combine. Return the soup to the pot and bring to a simmer. If the soup seems thin, let it simmer for 5 to 10 minutes to reduce slightly. (Remember: The soup will continue to thicken as it cools.) Season to taste with salt and pepper.
   

5. Serve hot. Garnish each serving with a swirl of rosemary oil, a few croutons, and a sprinkle of lemon zest.