The method.
This is a Juicy Lucy — the Minneapolis classic where the cheese goes inside the patty, not on top — built with Wisconsin cheese curds instead of processed cheese. The curds melt into a cleaner, squeakier molten core. The entire challenge is keeping that core sealed inside until you bite it.
Mix and divide the meat.
Gently mix the chuck with salt, pepper, and Worcestershire — don't overwork it or the burgers turn dense. Divide into 8 thin equal patties (two per burger). Thin is good; you'll be sealing two together around the cheese.
Build the stuffed patties.
Pile about an ounce of chopped Gardner's curds in the center of four patties, leaving a clear half-inch border. Top each with a second patty. Now pinch the edges together all the way around, sealing completely — work around the full circumference twice. Any gap is where the cheese escapes.
Sear hot, then finish.
Grill or cast-iron sear over medium-high, about 4 minutes a side for medium. Flip once. Do not press the patty — ever. Pressing forces the molten core out through any weak seam and you lose the whole point.
Check temperature.
Pull at 155-160°F internal (the cheese core reads cooler than the meat, so probe the beef itself). The curds inside will be fully molten by the time the beef is cooked through.
Rest, then build.
Rest the burgers 3 minutes — the molten cheese core is genuinely scalding straight off the heat. Toast the buns, build with lettuce, tomato, onion, and your condiments, and bite carefully. The first bite of a properly sealed one is the payoff.
Pressing a burger on the grill is always a mistake. With a stuffed burger it's a catastrophe — you're squeezing molten cheese out through the seam you worked so hard to seal.
Notes from testing.
Across nine tests, sealing technique was the whole ballgame. Pinching twice around the full circumference cut blowouts to nearly zero; a single quick pinch leaked about half the time. Chopping the curds (rather than leaving them whole) gave a more even melt and fewer pressure points to rupture the seam. 80/20 chuck mattered — a 90/10 test batch went dry and crumbly around the core.
Variations worth trying.
Garlic & Dill core — swap in Gardner's Garlic & Dill curds for a herby, garlicky molten center; skip extra seasoning. Jalapeño — mix chopped pickled jalapeño in with the curds. Breakfast version — top with a fried egg and serve on an English muffin. Patty melt — skip the bun, serve between griddled rye with caramelized onions.