Tray Size, Wood, Bag: The Best Lump Charcoal for Pizza Oven Fires

A multi-fuel pizza oven like the Ooni Karu, a kamado and a kettle all burn the same thing, but they ask different things of it. A small pizza oven tray wants pieces that fit and catch fast. A kamado wants big, dense lumps that hold a fire for hours. And carne asada on a grill wants a hot, quick fire with some character in the smoke, which is why mesquite lump has such a following in northern Mexican and Texas cooking.

Lump charcoal is wood that has been charred into carbon, without the binders and fillers that hold briquettes together. Bags differ in the wood they start from, how big the pieces are, and how honestly the maker describes both. This guide compares the lump charcoal worth buying for pizza ovens, kamados and grills, using what each maker states and nothing more.

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Quick verdict: which lump charcoal to buy for your oven

The rest of this page explains why, and how to match the bag to the cooker you own.

Five lump charcoals compared

Our five standout bags, one for each kind of cook, with the wood, origin and size each maker or listing states. All seven bags are reviewed in full below.

Product images from Amazon. Wood species, origin and sizes are as stated by each maker or listing; burn times and temperatures are the makers’ claims, not ours. Check the listing before you buy.

Why a pizza oven is pickier about charcoal than a grill

A kettle or kamado has a big firebox, so almost any lump will do. A portable multi-fuel oven does not. Ooni’s manual for the Karu 12G, the oven now sold as the Karu 2, says to add no more than 0.9 pound of fuel at a time and to keep no more than 1.1 pounds in the tray at any time. It also says to use only charcoal suitable for cooking, and not to cook until the fuel has a coating of ash. Ooni says the Karu 12 reaches up to 950°F.

That small tray is the reason piece size matters. A handful of medium lumps fills it evenly and lets air through; one fist-sized chunk can take up the whole tray. The manual says the tray takes both wood and charcoal, and limits wood to dry, untreated hardwood pieces up to 5.9 inches long and 1.5 inches thick, so many cooks build a charcoal base and add small pieces of wood for flame. If you are still choosing the oven, our guide to the best pizza oven covers the Karu 2 alongside gas models.

Our picks for the best lump charcoal for pizza oven, kamado and grill

Seven bags: a medium-lump bag sized for pizza oven trays, a dense extra-large lump for kamados, a mesquite lump for carne asada, a small bag for trying lump and three American hardwood blends. Each review says plainly when the maker does not state a detail.

How to choose lump charcoal for a pizza oven, kamado or grill

In a kitchen, fuel is chosen like any ingredient: by what the dish and the equipment need. Five things decide which bag is right for you.

1. Piece size for your firebox

This matters most for small pizza ovens. Ooni’s Karu 12G manual caps the tray at 1.1 pounds of fuel, so medium pieces like FOGO’s Premium bag load evenly, while extra-large chunks like Jealous Devil Chunx XL need breaking down. In a kamado the logic flips: big pieces burn longer and leave air channels for a low, steady fire. Most makers do not state a piece size, so plan to sort any ungraded bag by hand.

2. The wood, and whether the maker names it

Lump tastes of the wood it came from, mildly. Mesquite gives the bold smoke that carne asada is known for; oak and hickory are the all-round choices; dense quebracho blanco is chosen for heat and burn time. A maker that names the species, as Jealous Devil, Rockwood, Royal Oak and Best of the West do, is telling you more than one that says only “hardwood”. For more smoke flavor on a long cook, add wood chunks; our guide to the best smoker wood chips covers which woods suit which meats.

3. No additives

Every bag here states no fillers, binders or chemical additives, or describes itself as all-natural. Ooni’s manual asks only for charcoal suitable for cooking and warns against lighting the oven with spirit or petrol. Light lump with a natural firestarter or a chimney, never with gasoline or other fuels.

4. Bag size against how often you cook

A pizza oven uses about a pound per load, so a 35-pound bag lasts a long time. Lump that sits open in a damp garage gets harder to light, so buy a size you will use, or a bag that reseals, like Jealous Devil’s, or two smaller bags, like B&B’s.

5. Storage

Few makers give storage advice, but charcoal absorbs moisture. Keep bags closed, off the ground and dry, and away from the grill while it is lit. Jealous Devil’s waterproof, resealable bag is the only packaging here designed for that job.

Lighting lump charcoal safely

Read your oven’s or grill’s manual first. These rules come from Ooni’s Karu 12G manual, the National Fire Protection Association’s grilling safety tip sheet and the US Consumer Product Safety Commission:

• Use charcoal grills only outdoors, well away from the home, deck railings, eaves and overhanging branches (NFPA). Ooni says not to use its oven indoors or in a confined or habitable space such as a house, tent, caravan, motor home or boat, because of the danger of fatal carbon monoxide poisoning.
• Never use charcoal to cook or for heat inside enclosed areas, because the carbon monoxide can kill you (CPSC).
• Chimney starters let you start charcoal with newspaper as the fuel (NFPA); our guide to the best chimney starter compares them. If you use starter fluid on a grill, use only charcoal starter fluid and never add it or any other flammable liquid to a fire (NFPA). Ooni says not to use spirit or petrol to light or relight its oven.
• Keep children and pets at least three feet from the grill area, and never leave the grill unattended (NFPA).
• In a Karu, do not cook until the fuel has a coating of ash, and before first use heat the oven with the fuel red hot for at least 30 minutes (Ooni).
• When you finish, let the coals cool completely before disposing of them in a metal container (NFPA). Ooni says not to remove the ash until the oven has cooled completely.

How we chose these seven bags

We started from what a kitchen asks of fuel: a predictable fire, a known wood, and nothing in the bag but charcoal. We read Ooni’s Karu 12G manual and Ooni’s Karu product page to understand what a multi-fuel oven needs, then searched Amazon in the United States for lump charcoal from makers that describe their product, checked every bag’s stock with Amazon’s product data, and read the maker’s own page where we could reach one (Royal Oak, Cowboy, Rockwood and B&B; FOGO’s site for its two bag grades). Otherwise the details come from the brand’s Amazon listing, and each review says when something is not stated. Burn times and temperatures are always the maker’s claims. Kamado Joe’s Big Block lump was out of stock when we checked, and we did not find Ooni’s own lumpwood charcoal, sold on Ooni’s website, in our Amazon searches, so neither is reviewed here. We left out unbranded and “Generic” bags and bags down to their last few units. We have not used these charcoals for this guide, and we did not rely on any review site’s rankings.

Lump charcoal questions, answered

Can you use lump charcoal in an Ooni Karu?

Yes. Ooni says the Karu 12 runs on wood, charcoal or, with a burner sold separately, gas. The Karu 12G manual says the fuel tray is for wood and charcoal, to use only charcoal suitable for cooking, and to wait for an ash coating before cooking.

How much charcoal goes in a pizza oven tray?

For the Karu 12G, Ooni says to add no more than 0.9 pound at a time and keep no more than 1.1 pounds in the tray. Other ovens differ, so check your manual.

Is lump charcoal better than briquettes for a pizza oven?

Ooni’s tray is built for wood and charcoal, and lump is charcoal without binders, so it is the usual choice. Briquettes are uniform but contain binders and leave more ash, which Cowboy and Rockwood both point to when they compare their lump with briquettes.

Which lump charcoal is best for carne asada?

Mesquite, if you want the traditional flavor: Best of the West’s bag is 100% mesquite lump. For a hot fire with milder flavor, oak and hickory lump such as Royal Oak or Rockwood works well.

Can you reuse lump charcoal?

Often, yes. Rockwood says to close the grill lid and vents for 48 hours to put partly burned lump out, and Best of the West says its mesquite can be put out with water and reused once dry. In a pizza oven, Ooni says to let the fire burn down naturally.

Our choice for pizza night and the grill

Buy FOGO Premium medium lump if a multi-fuel pizza oven is part of your setup: the medium pieces suit the small tray, and the same bag runs a kettle. Choose Jealous Devil Chunx XL for kamados and long cooks, and Best of the West mesquite when the fire is for carne asada. For the cooker itself, see our guides to the best pizza oven and the best charcoal grill.

Burning wood instead? See our guide to the best wood for Ooni pizza ovens.

And if you would rather someone else tended the coals tonight, see the menu or call to order.