Bake 4 cups curly fries as the label directs. Meanwhile, make the cheese sauce: Melt 1 stick butter in a saucepan over medium-high heat. Sprinkle in 1/4 cup flour and whisk until smooth, 2 minutes. Gradually whisk in 1 cup milk and a pinch of nutmeg; whisk until smooth, 3 minutes. Add 8 ounces cubed Velveeta cheese and whisk until melted, about 5 minutes. Whisk in 1/4 cup lager beer or chicken broth, 1 teaspoon hot sauce and 1/2 teaspoon kosher salt. Add the fries and toss.