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1
Preheat an oven to 350u00b0F.
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2
In a small bowl, toss the bread crumbs with 2 Tbs. of the olive oil and transfer to a baking sheet. Bake, stirring occasionally, until the bread crumbs are golden brown and crisp, 15 to 20 minutes. Let cool to room temperature. In a bowl, toss the bread crumbs with the parsley and lemon zest, and season with salt and pepper. Set the gremolata aside.
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3
In a nonstick fry pan over medium heat, cook the pancetta, stirring occasionally, until the fat has rendered and the pancetta is browned and crispy, 8 to 10 minutes. Using a slotted spoon, transfer the pancetta to a paper towel-lined plate. Set aside.
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4
In a Dutch oven over medium heat, warm the remaining 2 Tbs. olive oil. Add the onion, shallots and celery and cook, stirring occasionally, until softened, 8 to 10 minutes. Add the cauliflower and cook, stirring occasionally, for 1 to 2 minutes. Season with salt and pepper. Add the 5 cups stock, increase the heat to medium-high and bring to a boil. Reduce the heat to medium-low, cover and simmer until the cauliflower is tender, about 30 minutes.
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5
Using an immersion blender, puree the soup until smooth. Adjust the seasonings with salt and pepper. Add more stock if needed to reach the desired consistency. Stir in the lemon juice and cream. Ladle the soup into warmed bowls. Top with the crispy pancetta and gremolata and serve immediately.
