In a 5-quart pot, combine the milk, stock, and garlic. Generously season the mixture with salt. Pour the grits into the cold liquid and bring the mixture to a boil, whisking constantly. Immediately reduce the heat to a simmer and continue to stir until the grits are soft and creamy, at least 20 minutes. If necessary, add more stock to continue cooking the grits. Stir in the butter, mascarpone, and herbs.

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