Heat the broiler.
Combine the kale pulp, mayonnaise, Parmesan, lemon zest and juice and 1 cup of the Gruyere in a bowl and mix to combine. Transfer the mixture to a 9-inch pie dish or medium ovenproof skillet and top with the remaining 1 cup Gruyere.
Place under the broiler until the cheese starts to brown and the mixture starts to bubble, about 5 minutes. Serve warm with chips or crostini.
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