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### Instructions:
1. **Caramelize the Onions:**
In a skillet over medium heat, melt butter and add sliced onions. Cook slowly for 15–20 minutes, stirring often, until soft, golden, and jammy. Set aside.
2. **Make the Secret Sauce:**
In a small bowl, mix together mayonnaise, ketchup, mustard, relish, and hot sauce (if using). Season to taste. Refrigerate until ready to use.
3. **Cook the Patties:**
Shape ground beef into 2 thin oval-shaped patties, slightly larger than your bread slices. Season with salt, pepper, and Worcestershire if using. Cook in a hot skillet or griddle for 3–4 minutes per side, until browned and cooked through. Set aside.
4. **Assemble the Melts:**
Spread secret sauce on one side of each bread slice. Layer on a slice of cheese, a cooked beef patty, caramelized onions, and another slice of cheese. Top with the second bread slice, sauce-side down.
5. **Grill to Perfection:**
Butter the outsides of the sandwich and grill in a skillet over medium heat until golden brown and crispy on both sides, and the cheese is fully melted (about 3–4 minutes per side).
6. **Serve & Enjoy:**
Slice in half, let the cheese stretch, and serve immediately with fries, pickles, or a crisp salad.
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### Variations & Add-Ons:
* 🔥 **Spicy twist:** Add jalapeños or use pepper jack cheese
* 🧄 **Garlic lovers:** Mix a bit of garlic powder into the secret sauce
* 🥓 **Go big:** Add crispy bacon between the layers
* 🥬 **Lighter version:** Swap beef for turkey patties or a plant-based option
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### Final Thoughts:
The **Ultimate Patty Melt with Secret Sauce** is everything you love about diner food — turned up a notch. The richness of the beef, the sweetness of caramelized onions, and the tangy-creamy kick of the sauce all melt together between two crispy, buttery slices of bread. It’s bold, messy, and absolutely irresistible.
Whether you’re serving this for a casual family dinner, game night with friends, or a satisfying solo meal, this patty melt hits the spot every time. Don’t be surprised if it becomes your new go-to comfort food.
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