Can I prep the onions and sauce ahead of time?

Absolutely. Caramelized onions and secret sauce both keep well in the fridge for several days.

What’s the best bread if I don’t like rye?

Try sourdough, brioche, or even Texas toast.

Can I make it vegetarian?

Yes! Use a plant-based patty and vegan cheese.

How do I store and reheat leftovers?

Wrap in foil and refrigerate. Reheat in a skillet for best texture.

What makes the sauce "secret"?

It’s all about proportions. The balance of sweet, tangy, creamy, and savory makes it taste unique.

Patty Melt with Secret Sauce

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A classic diner favorite, the Patty Melt with Secret Sauce features juicy beef, caramelized onions, melty cheese, and a tangy homemade sauce—all grilled between buttery rye bread slices for a rich and comforting meal.

Author: Emily
Prep Time: 15 minutes
Cook Time: 25 minutes
Total Time: 40 minutes
Yield: 4 sandwiches 1x
Category: Main Course
Method: Grilling
Cuisine: American
Diet: Halal

Ingredients

Ground beef (80/20) – for a juicy and flavorful patty
Rye bread – adds tang and crisp texture
Yellow onions – caramelized for sweetness and depth
Swiss or American cheese – melts smoothly for a gooey bite
Butter – helps toast bread to golden perfection
Mayonnaise – creamy base for the secret sauce
Ketchup – adds sweet and tangy notes
Mustard – sharpens the sauce flavor
Pickle relish – adds crunch and acidity
Garlic powder, onion powder, paprika – build savory balance

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Instructions

Caramelize sliced onions in butter over low heat until golden and soft.
Form ground beef into patties slightly larger than your bread slices. Season and cook until browned and just cooked through.
In a bowl, mix mayonnaise, ketchup, mustard, pickle relish, and spices to make the secret sauce. Adjust seasoning to taste.
Butter the outsides of the rye bread. On the inside, spread secret sauce, add cheese, caramelized onions, and the beef patty.
Grill sandwich in a skillet or panini press over medium heat until bread is golden and cheese is melted.
Slice and serve hot, optionally with sides like fries or slaw.

Notes

Use cast iron for the best crust when grilling the sandwich.
Let onions cook slowly to bring out natural sweetness.
The sauce can be made ahead and stored for up to 5 days.
Try variations like adding bacon, jalapeños, or a fried egg.
Leftovers can be reheated in a skillet to restore crispness.

Nutrition

Serving Size: 1 sandwich
Calories: 720
Sugar: 6g
Sodium: 950mg
Fat: 45g
Saturated Fat: 18g
Unsaturated Fat: 22g
Trans Fat: 0g
Carbohydrates: 33g
Fiber: 2g
Protein: 35g
Cholesterol: 110mg

Find it online: https://recipeshots.com/patty-melt-with-secret-sauce/