Special equipment: a deep-frying thermometer
Fill a small Dutch oven
with 3 to 4 inches of oil and heat over medium heat until a deep-frying
thermometer inserted in the oil registers 325 degrees F. Line a large plate or baking sheet with paper towels.
In a medium bowl, whisk
together the flour, cornstarch, paprika, baking powder, garlic powder, onion powder, cayenne, 2 teaspoons salt and 1/2 teaspoon black pepper. Add 1 cup of the beer
and stir until smooth, adding more beer a tablespoon at a time if necessary until the batter is the consistency of heavy cream
. Set aside.
Using kitchen towels, dry the potatoes thoroughly. Working in batches, slide the potatoes into the oil, being careful not to crowd the pan, and cook until lightly golden, about 5 minutes. Use a slotted spoon or skimmer
to remove to the towel-lined plate and sprinkle with a few pinches of salt.
Raise the oil temperature to 350 degrees F. Dip the partially cooked fries
a few at a time in the batter to coat. Using a fork, slide the coated potatoes 1 at a time into the oil, about 6 or 8 in a batch so as not to overcrowd the pan. Use a metal skimmer or tongs to keep them separate, as they tend to cling together. Cook until deep golden brown, 2 to 3 minutes. Remove to fresh paper towels to drain
. Serve immediately.