Ingredients: 

Neutral oil, for frying (about 6 cups)

1/2 c. mayonnaise

3 tbsp. ketchup

2 tbsp. sweet pickle relish

1 tsp. distilled white vinegar

1 tsp. yellow mustard

Kosher salt

2 tbsp. unsalted butter

1 medium yellow onion, finely chopped

16 oz. frozen shoestring French fries, divided

6 oz. American cheese, chopped into 1/2″ pieces

1/3 c. whole milk

Steps to Make It: 

Step 1: In a heavy, 5-quart Dutch oven or pot fitted with a deep-fry or candy thermometer, heat oil over medium-high heat until thermometer registers 375°.

Step 2: Meanwhile, in a small bowl, whisk mayonnaise, ketchup, relish, vinegar, mustard, and 1/4 teaspoon salt to combine.

Step 3: In a large skillet over medium-high heat, melt butter. Add onion and 1/4 teaspoon salt and cook, stirring occasionally, until onion is well browned and translucent, 8 to 10 minutes. Transfer onions to a small bowl; set aside. 

Step 4: Using a metal spider, lower half of fries into oil and cook, stirring to keep fries from sticking together, until golden brown, 4 to 5 minutes. Using spider, transfer fries to a paper towel-lined sheet tray; season with a pinch of salt. Repeat with remaining fries. 

Step 5: In a small heatproof bowl, microwave cheese and milk in 30-second increments, whisking in between, until cheese is melted and smooth, about 3 minutes. 

Step 6: Top fries with cheese mixture, then cooked onions, and finish with animal sauce. 

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