Ingredients
- 1 tablespoon unsalted butter
- 1 large yellow onion, diced small
- Kosher salt and freshly ground black pepper
- 1 pint heavy cream
- 1/2 cup finely grated Gruyere
- 1/2 cup finely grated Parmesan
- 1 teaspoon Worcestershire sauce
- 1/4 teaspoon freshly grated nutmeg
- 8 "grates" lemon zest (about 1/2 teaspoon)
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