Ingredients
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3 pounds potatoes, thinly sliced
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½ onion, thinly sliced
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9 tablespoons all-purpose flour, divided
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6 tablespoons butter, diced and divided
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6 tablespoons Simon's Secret Sauce (any flavor)
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Salt (Simon recommends Simon's Truffle Salt) and ground black pepper to taste
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3 cups whole milk, or as needed
Directions
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Preheat oven to 375 degrees F (190 degrees C). Grease a 9x13-inch baking dish.
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Spread about 1/3 of the potato slices into the bottom of the prepared baking dish. Top with about 1/3 of the onion slices. Sprinkle 3 tablespoons flour over the potato and onion. Arrange 2 tablespoons butter atop the flour. Add 2 tablespoons Simon's Secret Sauce. Season the entire layer with salt and pepper. Repeat layering twice more.
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Heat milk in a saucepan until warm. Pour enough warm milk over the mixture in the baking dish so the top of the liquid is level with the final layer of potatoes.