[Kamado Joe] First Overnight Brisket: 15lb Packer, DIY Rub, 18-Hour Hot Hold... and a Series of Questionable Decisions
The Goal
Attempt an overnight packer brisket cook on a Kamado Joe Classic Joe using the SlōRoller. The target was a juicy, buttery-soft flat without a super-crunchy or charred bark.
Setup & Fire Management
- Cooker: Kamado Joe Classic Joe using the SlōRoller heat deflector paired with the ceramic deflector shield underneath to create an indirect setup.
- Drippings & Moisture: Placed an aluminum foil pan directly below the brisket to catch fat drippings, and added a steel pan filled with water on the grill grates.
- Fuel & Smoke: Loaded with premium lump charcoal and several chunks of hickory smoking wood.
- Temperature Target: Stabilized the pit at 225°F before loading the meat.
Pre-Cook Prep & Trimming
Started with a whole untrimmed packer brisket and had to do a fairly aggressive trim, as there was a ton of hard, un-renderable fat to work through. Looking closely at the final slices, I still don't think I rendered enough of that thick deckle fat during the cook.
| Item / Category |
Weight (Grams) |
Weight (Pounds) |
% of Untrimmed Brisket |
| Untrimmed Packer Brisket |
6,908 g |
15.23 lbs |
100.00% |
| Gristle / Scrap |
136 g |
0.30 lbs |
1.97% |
| Usable Meat Trimmings (sausage/burgers) |
694 g |
1.53 lbs |
10.05% |
| Fat Trimmings (rendered for tallow) |
1,394 g |
3.07 lbs |
20.18% |
| Smoker-Ready Brisket |
4,684 g |
10.33 lbs |
67.81% |
| Total Trim Loss |
2,224 g |
4.90 lbs |
32.19% |
The DIY Rub Batch (75g Total Batch, ~55–60g Applied)
| Ingredient |
Mesh / Grind |
Weight (Grams) |
| Black Pepper |
16-mesh coarse grind |
32.0 g |
| Coarse Kosher Salt |
Diamond Crystal / Morton |
24.0 g |
| Granulated Garlic |
Coarse powder |
10.0 g |
| Granulated Onion |
Coarse powder |
4.0 g |
| Smoked Paprika |
Fine ground |
2.5 g |
| Chili / Cayenne Pepper |
Fine ground |
1.5 g |
| Cumin |
Ground |
1.0 g |
| Total Batch Weight |
|
75.0 g |
Timeline of Events & Observations
- 11:00 PM (Night 1): Loaded onto the Classic Joe fat-side up over hickory/lump charcoal.
- Overnight Dip: Had a pit temperature dip down near 200°F overnight. Adjusted vents in a sleep-deprived daze.
- The "Fake Stall" Trap: Watched my probe sit at 150°F–165°F for hours. Thought I was stuck in a long stall.
- Mistake #1 — Suspected Bad Probe Placement: My best guess is that the probe tip was resting directly inside or right against the deckle fat seam. Since fat insulates, it read a stubborn ~165°F while the lean muscle of the flat was likely already climbing well past 190°F.
- Mistake #2 — Unwrapped All the Way: Because the faulty probe reading made me think it was stalling, I never wrapped it. Ended up cooking it 100% unwrapped for 14+ hours until I manually checked it with an instant-read probe.
- Mistake #3 — Disappointment with the Bark: When I pulled it off, I was initially bummed out that it wasn't jet-black Texas offset charcoal. (The Kamado Joe humidity keeps it more deep mahogany/dark red).
- 3:30 PM (Day 2): Pulled off the smoker after probing "like warm butter" across the flat.
- 4:00 PM: Vented on the counter down to 170°F (to stop carryover cooking), slathered with homemade rendered tallow, wrapped tightly in heavy-duty foil, and tossed into a 150°F oven.
- Mistake #4 — The Mid-Rest Panic: 6 hours into the hot hold, I opened the foil to poke it. It felt firm and tight. At 15 hours in, I squeezed the foil package and it literally felt like a brick. I was convinced I ruined an expensive brisket and turned it into leather.
Yield Stats & Final Weights
- Total Trim Loss: 32.19% (At least the rendered tallow yield was great)
- Final Cooked Meat Weight: 2,905g (~6.40 lbs)
- Cooked Yield: 62% of raw smoker-ready weight (38% moisture/fat loss during the cook)
The Reveal & Results
The moment I unwrapped and sliced across the grain:
* Deep pink smoke ring.
* The flat was so soft and pliable it completely draped over my gloved finger without breaking.
* Fat Rendering: While the intermuscular fat rendered down okay, looking closely at the cut slices, I definitely did not render enough of the thick deckle fat seam.
* Only flaw: The very thin tail end of the flat was a bit dry—expected after 14 hours unwrapped + 18 hours holding. Chopped those ends up for chili/tacos, and vacuum-sealed 5 meal-sized portions for the freezer!
Questions for the Experts / Room for Improvement
- Preventing Dry Ends: For the thin tail end of the flat, do you usually trim that off before the cook to freeze for burgers, or do you leave it on and just accept it as "chef's treat / chili meat"?
- Probe Placement Tips: On a tapered flat, what is your go-to technique for ensuring your probe tip stays dead-center in the lean muscle without drifting into the intermuscular fat seam?