Dinner / Sandwiches, burgers & pizza
Patty Melt with Slow-Cooked Onions
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Give the onions twenty minutes over low heat, until they turn soft, sweet and the color of toffee. Then it's thin beef, melted Swiss and buttered rye toasted crisp, with everyone at the counter waiting their turn.
The short version
Cook sliced onions low and slow for 20 to 25 minutes, shape thin seasoned patties, sear them 2 minutes per side, then stack with Swiss and onions on buttered rye and toast until crisp. About 50 minutes.
What makes ours better
small changes, very loud compliments
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Caramelize the onions. Slow cooking turns sharp onions jammy and sweet. They're what makes a patty melt taste different from a cheeseburger.
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Shape the patties thin and wide. Patties slightly bigger than the bread shrink to fit and cook through in minutes, so the beef stays juicy and the cheese melts before the bread burns.
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Worcestershire in the beef. A little in the meat adds savory depth, which a thin patty needs to taste like more than toast.
What you need
check the pantry before you promise anyone
- Yellow onions2 large
- Unsalted butter2 tablespoons
- Ground beef1¼ pounds
- Seedless rye bread8 slices
- Swiss cheese8 slices
Onions
Patties and sandwiches
read it twice. buy it once.
Steps
apron on. phone down. mostly.
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Start the onions
Melt 2 tablespoons butter in a large skillet over medium heat. Add the onions and ¼ teaspoon salt and stir to coat. Cook 5 minutes until they start to soften, then lower the heat to medium-low.
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Caramelize them
Keep cooking, stirring every few minutes and scraping up any brown bits, 15 to 20 minutes more, until the onions are soft, deep golden and sweet. If they stick or scorch, add a spoonful of water. Scoop them into a bowl and wipe out the pan.
Don't turn the heat up to hurry them. Browning too fast leaves them bitter and half raw.
About 20 min. Cook mode has a timer for this step.
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Shape the patties
Gently mix the beef with the Worcestershire, salt and pepper. Divide into 4 portions and press each into a thin oval about ¼ inch thick, slightly larger than a slice of bread. They shrink as they cook.
Handle the meat as little as you can. Overworked beef turns dense.
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Sear the patties
Heat the same skillet over medium-high heat. Cook the patties 2 to 3 minutes per side, until browned and no longer pink in the center. They should reach 160°F. Move to a plate and drain off all but a thin film of fat.
About 5 min. Cook mode has a timer for this step.
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Assemble the sandwiches
Butter one side of each bread slice. Set 4 slices butter side down. Spread the other side with mustard or dressing if using. Top each with a slice of Swiss, a patty, a quarter of the onions, another slice of Swiss and a second slice of bread, butter side up.
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Toast and melt
Set the skillet over medium-low heat. Toast two sandwiches at a time, 3 to 4 minutes per side, pressing gently with a spatula, until the bread is golden and crisp and the cheese is melted. Repeat with the others.
If the bread browns before the cheese melts, drop the heat and cover the pan for a minute.
About 8 min. Cook mode has a timer for this step.
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Cut and serve
Cut each sandwich in half on the diagonal and serve hot, while the bread still crunches.
Good to know
things I learned the hard way, so you can skip that part
- The onions can be made up to 3 days ahead and kept in the fridge. Reheat in the skillet while the patties sear.
- Rye is traditional, but sourdough or thick white bread works too.
- Each patty is 5 ounces. For a lighter sandwich use 4 ounces per patty, 1 pound of beef in all. Pour off extra fat before assembling.
- Storage. Best eaten right away. The onions and raw seasoned patties keep, covered, in the fridge for 1 day. Reheat a leftover sandwich in a 350°F oven for 10 minutes.
Questions, answered
asked and answered at the kitchen counter
What cheese goes on a patty melt?
Swiss is the classic. American melts the smoothest, and a mix of Swiss and American is excellent too.
What is the difference between a patty melt and a burger?
A patty melt is served on toasted bread, usually rye, with grilled onions and melted cheese. It is griddled like a grilled cheese.
How do I know when the patty melt is done?
The bread should be golden and crisp on both sides and the cheese fully melted. The beef is done when it reaches 160°F or has no pink.
Can I use ground turkey?
Yes, but cook the patties to 165°F and add a tablespoon of oil to the pan, because turkey is leaner and sticks.
Can I make the onions ahead of time?
Yes. Caramelize them up to 3 days ahead and refrigerate. Rewarm them in the skillet before assembling.
From the table
Made it? Tell me how it went, and who went back for seconds when they thought nobody was looking.
Made it?
tell me the truth, then tell me who had thirds
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Published October 29, 2026.