Animal Style Fries

1 . Stage

Prepare the Spread: Whisk together mayonnaise, ketchup, relish, sugar, and vinegar in a small bowl until well combined. Cover and set aside until serving.

2 . Stage

Prepare the Grilled Onions: Heat butter and oil in a large skillet over medium. Add onions and salt; cook, stirring occasionally, until softened and golden brown, about 20 minutes. When skillet starts to become dry, add 1 tablespoon of water. Continue cooking, stirring often, adding more water, 1 tablespoon at a time, as needed, until onions are very soft, deeply browned, and jammy, 10 to 15 more minutes (you may not need to use all the water). Cover and set aside to keep warm.

3 . Stage

Prepare fries according to package instructions.

4 . Stage

Divide fries evenly among 4 plates; immediately top with 1 slice cheese, 3 tablespoons grilled onions, and 3 tablespoons spread.