Prep the Onions
Slice onions very thin—this helps them caramelize into the beef.Heat the Skillet
Preheat a cast iron skillet or griddle over medium-high heat with oil or butter.Smash the Patties
Place a small mound of onions on the skillet. Add ¼ lb of beef on top and use a spatula to smash it flat into the onions. Season with salt and pepper.Fry Until Crispy
Cook 3–4 minutes until the edges are dark golden and crispy. Flip in one piece, press gently, and cook another 2–3 minutes.Melt the Cheese (Optional)
Add a slice of American or cheddar cheese during the last minute so it melts perfectly.Toast the Buns
Lightly butter and toast the buns on the skillet until golden.Assemble & Serve
Place patties on buns and top with mustard, ketchup, and pickles. Serve immediately.
Why This Burger Works
- Smash technique = more surface area for searing
- Onions cooked into the beef = deep caramelized flavor
- Simple toppings = let the beef and onion shine
Serving Suggestions
- Serve with crispy fries or tater tots for the ultimate diner-style meal
- Pair with coleslaw or potato salad for a backyard BBQ vibe
- Add a cold soda or a thick milkshake for old-school nostalgia
Pro Tips
- Use yellow onions—they caramelize best.
- Don’t press the burger after flipping—it’ll lose juices.
- Preheat your skillet properly before cooking for the crispiest crust.
- For outdoor grilling, use a cast iron pan on the grill grates.
FAQs
Q: Can I make it with lean beef?
A: You can, but 80/20 beef gives the juiciest result. Lean beef may dry out.
Q: Can I meal prep this?
A: Slice onions ahead of time, but always smash patties fresh for maximum crispiness.
Q: What’s the best cheese for this burger?
A: Classic American cheese melts beautifully, but cheddar works too.