Ingredients

• 3 tablespoons extra-virgin olive oil
• 1 clove garlic, lightly crushed
• 1 1/2 cups sliced leek, white and pale green parts only
• 3/4 cup diced celery
• 2 1/4 cups chicken stock mixed with 2 1/4 cups water
• 1/2 cup heavy cream
• 4 1/2 cups shelled English peas (about 4 1/2 pounds unshelled)
• 3 tablespoons coarsely chopped fresh Italian flat-leaf parsley
• 1 teaspoon minced fresh thyme leaves
• 1/8 teaspoon powdered ascorbic acid (1 tablet vitamin C crushed)
• Sea salt, preferably gray salt
• Freshly ground black pepper
• Creme fraiche, basil oil, finely sliced fresh chives, or prosciutto bits, optional

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Instructions

1. Heat the olive oil in a large saucepan over moderate heat. Add the garlic and let it sizzle for about 1 minute, then add the sliced white and pale green parts of the leek and celery. Stir often while cooking until the vegetables soften, about 8 minutes. Do not let them color. Then pour the diluted stock into the saucepan and bring to a simmer.
2. Add the cream to the vegetable mixture and bring to a simmer. Add the peas and return to a simmer. Adjust the heat to maintain a gentle simmer and cook until the peas are just tender, about 8 minutes. Add the parsley and thyme and simmer for 1 minute longer, then remove from the heat. Transfer in batches to a blender with the ascorbic acid and puree, adding more of the stock-water mixture as needed to thin the soup to a pleasing consistency. Pour soup into a bowl set in an ice bath and stir until cooled. (we want to cool it down as quickly as possible) Serve soup with optional garnishes.