Begin by prepping all your vegetables to avoid any rush during cooking. Shred the iceberg lettuce into 1/2-inch ribbons, dice the tomatoes into 1/2-inch pieces, mince the red onion finely, slice the dill pickles, and finely dice the large onion into 1/4-inch pieces. Grate the sharp cheddar cheese from a block—freshly grated cheese melts much more smoothly than pre-shredded. While prepping, preheat your oven to 400°F and spread the frozen french fries on a baking sheet. Season them lightly with a pinch of sea salt and cracked black pepper, then place in the oven to bake for 15-25 minutes until golden and crispy.
While the fries cook, prepare the sauce by combining the greek yogurt, mayo, ketchup, yellow mustard, cajun seasoning, and sugar in a bowl. Whisk until smooth, then add the dill pickle juice 1 tablespoon at a time, tasting as you go to reach your desired tanginess. I always use Hellmann's mayo for the creamiest texture and Lea & Perrins Worcestershire for deeper umami flavor. Set the sauce aside until ready to serve.
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the diced onions and cook for 2 minutes, stirring occasionally, until they begin to soften and become fragrant. Break apart the ground beef into small crumbles and add it to the skillet, then immediately sprinkle in the onion powder, garlic powder, smoked paprika, Worcestershire sauce, garlic salt, and pepper. Cook for 5-7 minutes, stirring frequently and breaking the meat into small pieces as it browns—you want it well-caramelized and fully cooked through. The meat should be deeply browned and the onions tender and incorporated into the mixture.
Once the fries are golden and crispy, divide them evenly among serving bowls. Top each portion of fries with a generous helping of the cooked meat mixture from Step 3. Immediately sprinkle the freshly grated sharp cheddar over the hot meat—the residual heat will start to melt it. Layer the shredded lettuce, diced tomatoes, sliced pickles, and minced red onion on top of the cheese, creating a vibrant base for the sauce.
Drizzle the special sauce from Step 2 generously over each bowl, adjusting the amount to your preference. Serve immediately while the fries are still warm and crispy and the cheese is melting. I like to serve extra sauce on the side so everyone can customize their bowl to their taste.