These are pan-seared ground beef patties finished with a spoonful of roasted bone marrow whipped into butter — no bun, no filler, just beef and fat doing the work. The whole thing comes together in one cast iron skillet, and the marrow butter can be made ahead so weeknight cooking stays fast. If you want a rich, satisfying beef dinner with almost no cleanup, this is a smart recipe to have in rotation.
Before you start
Two things actually matter here. First, get your cast iron skillet genuinely hot before the patties go in — not warm, hot. A properly preheated pan gives you a deep brown crust in about three minutes per side without steaming the meat. If the pan isn’t hot enough, the patties will release liquid and turn gray instead of searing. Second, roast the marrow bones before you do anything else. They need about 20 minutes at 450°F, and the marrow has to cool slightly before you can scoop and mash it into the butter. Do that step first, then prep and cook the patties while the butter firms up — the timing lines up cleanly and you won’t need an extra pot or pan.
Mistakes to avoid
- Pressing the patties while they cook. It squeezes out the fat you want. Shape them, put them down, and leave them alone until it’s time to flip.
- Pulling the marrow too early. If the marrow is still firm and white in the center after roasting, it needs more time. It should be soft, slightly translucent, and pull away from the bone easily with a spoon.
- Using cold butter for the marrow butter. Cold butter won’t incorporate — the marrow will sit in lumps. Let the butter come to room temperature first so it mashes together smoothly.
- Skipping the rest after cooking. Ground beef patties benefit from two to three minutes off heat before you top them. It lets the juices redistribute so the marrow butter melts into the meat instead of pooling on the plate.
- Under-seasoning the marrow butter. Marrow on its own is mild. Salt it more than you think you need to — it has to season the whole patty from the top down.
Substitutions that actually work
Bone marrow bones can be hard to find at a standard grocery store — ask the butcher counter directly, or check a Latin or Eastern European market where they’re usually stocked and cheap. If you genuinely can’t get them, a small amount of beef tallow stirred into softened butter gets you most of the richness, though the flavor is less pronounced. For the beef, 80/20 is the right call here; skip the egg in the mix — it makes the patty mushy and you don’t need a binder when there’s no filler. If you only have 90/10 on hand, add a small pat of butter to the skillet before the patties go in to compensate for the lower fat content.
Keeping and reheating
Cooked patties keep in the fridge for up to three days in an airtight container. Reheat them in the same cast iron skillet over medium-low heat with a splash of water and a lid — about three to four minutes — so they warm through without drying out. The marrow butter stores separately in the fridge for up to one week, tightly wrapped; it also freezes well for up to two months if you roll it into a log in plastic wrap. Reheat the butter at room temperature for ten minutes before using rather than microwaving it, which can separate the fat.
Carnivore Diet Hamburger Steaks with Bone Marrow Butter
Ingredients
For the Hamburger Patties:
- 1 lb 80/20 grass-fed ground beef preferably fresh, not frozen for more tender sear
- 1 tsp sea salt Redmond Real Salt or any mineral-rich salt
- ½ tsp fresh cracked black pepper optional, omit if following strict carnivore
For the Bone Marrow Butter Topping:
- 2 pieces beef marrow bones (3-inch center cut bones) ask butcher for canoe cut if possible
- 2 tbsp unsalted grass-fed butter room temperature
- 1 pinch sea salt to taste
Instructions
- Preheat your oven to 400°F (200°C). Place marrow bones on a foil-lined baking sheet, marrow side up, and roast for 15-20 minutes until marrow is bubbling and soft.
- While marrow roasts, form the patties. Divide ground beef into two portions and shape into thick patties (about 3/4 inch thick). Using your thumb, indent the center slightly to avoid puffing up during searing. Season both sides with salt and optional pepper.
- Heat a cast iron skillet over medium-high heat for 2-3 minutes. Add patties and sear 3-4 minutes per side for medium doneness, until a golden crust forms. Rest for 2-3 minutes off heat, tented loosely with foil.
- Make the marrow butter. Scrape cooked marrow from bones into a bowl. Add softened butter and salt. Mash together with a fork until well combined into a rich paste.
- Top patties with generous spoonful of bone marrow butter immediately before serving. Allow it to melt into the hot crust and enrich the flavor.
Notes
- Optional Twist: Add a pinch of smoked salt to the marrow butter for a bolder aroma.
- Need a Simpler Version? Skip the marrow and just top with grass-fed butter and a fried egg.
- Meal Prep Tip: You can roast bone marrow ahead of time and keep butter mixed and stored chilled for up to 5 days.
Nutrition
Your questions, answered
What internal temperature should these patties reach?
Ground beef patties need to hit 160°F (71°C) internal temperature — no exceptions. Unlike a whole-muscle steak, ground beef can carry surface bacteria throughout the grind, so cooking to a lower temperature isn’t safe regardless of the beef’s quality or source. A cheap instant-read thermometer takes the guesswork out completely.
Can I use pre-extracted marrow instead of roasting bones myself?
Yes — some butchers and specialty stores sell marrow already scooped out and frozen, and it works fine here. Thaw it in the fridge overnight, then warm it gently in a small dish set in hot water until it’s soft enough to mash, and proceed the same way as roasted marrow.
Do I need a cast iron skillet, or will a regular pan work?
A heavy stainless steel pan works if that’s what you have — the key is mass and heat retention, which cast iron just does better. Avoid nonstick for this recipe; it can’t handle the high heat needed for a proper sear and the coating may degrade at those temperatures.