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© Meredith Corporation. All rights reserved. Used with permission.
Heat 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 thyme 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 2 cups water and 1/4 teaspoon salt in a large soup pot or Dutch oven; add potato. Bring to a boil. Reduce heat to maintain a simmer and cook until very soft, 12 to 15 minutes.
When the onions are caramelized, stir sherry (or Marsala) into them; add them to the pot along with broth. Return to a simmer. Stir in spinach, cayenne and nutmeg; cover and cook, stirring once, until the spinach is tender but still bright green, about 5 minutes.
Remove from the heat, stir in goat cheese, butter and 1 tablespoon lemon juice; allow the butter and cheese to melt. 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). Taste and add more salt and/or lemon juice, if desired. Serve garnished with a large soup crouton and crumbled goat cheese, if desired.