This is a homemade take on In-N-Out’s Animal Style Double Double — two beef patties cooked mustard-side down, stacked with grilled onions, Thousand Island, American cheese, lettuce, and tomato on a standard bun. It comes together in about 30 minutes using ingredients you can find at any grocery store. If you live nowhere near an In-N-Out, this is a genuinely satisfying way to scratch that itch on a weeknight.
Why this recipe works
Two things actually drive the flavor here. First, smearing mustard directly on the raw patty and pressing it mustard-side down onto a hot, dry skillet creates a thin, tangy crust that you can’t get any other way — the mustard caramelizes fast and sticks to the beef rather than steaming off. Second, mixing a spoonful of Thousand Island into the grilled onions before they go on the bun keeps the onions from sliding around and distributes the sauce flavor into every bite instead of pooling at the edges.
Smart swaps
- Suzy-Q Santa Maria seasoning: If you can’t find it locally, a mix of equal parts garlic salt, black pepper, and smoked paprika gets you close enough. Avoid blends with added sugar — they’ll burn before the patty is cooked through.
- Thousand Island dressing: Any creamy, slightly sweet burger sauce works. A quick DIY: two tablespoons mayo, one tablespoon ketchup, one teaspoon sweet relish.
- American cheese: Stick with American here — it melts flat and fast in a skillet. Cheddar stays rubbery and slides off.
- Yellow mustard: Don’t swap for Dijon or spicy brown. Yellow mustard has the right water content to form that crust without burning too quickly.
Storage and reheating
Cooked patties keep in the fridge for up to 3 days in an airtight container. Reheat them in the same skillet over medium heat for about 2 minutes per side — they’ll come back to 160°F (71°C) without drying out the way a microwave does. Don’t store the assembled burger; the lettuce and tomato go soggy fast, so keep toppings separate and build fresh. Grilled onions also hold well in the fridge for 3 days and reheat in about a minute in a small pan.
Troubleshooting
- Mustard burns before the patty is cooked: Your skillet is too hot. Medium-high on most home burners is hotter than it sounds — if the mustard goes black in the first 2 minutes, pull the pan off the heat for 30 seconds and turn it down a notch before continuing.
- Cheese won’t melt: Add the cheese slice, then place a metal bowl or pan lid loosely over the patty for 60 seconds. The trapped steam finishes the melt without overcooking the beef.
- Patties shrink into thick pucks: Press a shallow thumbprint into the center of each raw patty before seasoning. It counteracts the natural contraction of the meat as it cooks and keeps the patty flat enough to stack properly.
- Bun goes soggy: Toast the cut sides of the bun in the same skillet for about 90 seconds after the patties come out. It takes no extra dishes and gives the bun enough structure to hold the sauce and onions without falling apart.
- Grilled onions are still sharp and crunchy: They need the full 7–10 minutes over medium heat with occasional stirring. If they’re still white and firm at 5 minutes, add a splash of water and keep going — they should be soft, golden, and slightly jammy before you pull them.
The Best Animal-Style Burger For Man Night
Ingredients
- ½ pound beef hamburger patties you will divide this into two.
- 2 tablespoons yellow mustard
- ¼ cup grilled onions in a small skillet, heat 1 tablespoon butter and brown the onions over medium heat, about 7 to 10 minutes, stirring here and there
- 2 tablespoons 1000 Island dressing or a comparable secret sauce
- 2 slices American cheese
- 1 tablespoon meat seasoning I use Suzy-Q’s, the Santa Maria style BBQ secret
- 2 leaves iceberg lettuce
- 2 slices tomato
- 1 regular hamburger bun
Instructions
- Once you’ve got the ingredients done and ready, like the grilled onions, it’s basically cooking a couple of burgers and putting it together.
- First, though, coat the patties with the seasoning. Then, smear a good amount of mustard on one side of the patty. In a hot skillet (medium-high heat), put the patties mustard-side down. Then, smear the upside of the patties with more mustard.
- After about 5 minutes or so, flip them and cook for another 5 minutes. Put a slice of cheese on each right before they’re done and get the cheese to melt a bit, but not totally.
- For the bun, smear a good amount of 1000 Island on each side of the bun. On the bottom part of the bun, lay the leaves of lettuce, and then put the two tomatoes on that. Mix some 1000 Island with the grilled onions and put those on the top part of the bun:
- Lay the finished patties on the tomatoes, and cover with the top bun. You will get a pseudo-Animal Style Double Double.
Notes
Nutrition
Common questions
Can I cook these patties on an outdoor grill instead of a skillet?
You can, but you’ll lose the mustard crust — the mustard drips through the grates before it has a chance to set. A cast iron skillet or griddle placed directly on the grill grates is the best compromise if you want that outdoor setup.
How do I know when the beef patties are done without cutting them open?
Use an instant-read thermometer and pull the patties at 160°F (71°C) internal temperature — that’s the safe target for ground beef. At a quarter-pound per patty with about 5 minutes per side on medium-high, you’ll usually land right there.
Can I make this with frozen beef patties?
Yes, but thaw them completely in the fridge first — overnight works well. Cooking from frozen makes it nearly impossible to get the mustard crust to form properly, and the center stays cold long after the outside looks done.
What’s the best way to scale this up for a group without cooking patties one at a time?
Use a large flat griddle or electric skillet — you can run four patties at once and they all get the same mustard-sear. Keep finished patties in a 200°F (93°C) oven on a rack for up to 10 minutes while you finish the rest; they’ll hold temperature without steaming themselves soft.