Blackstone Steak Fajitas: A Hard Sear on the Flat Top
Steak fajitas on a Blackstone are all about a hard, fast sear: the flat top holds steady screaming heat across a huge surface, so skirt or flank steak crusts in a couple of minutes without crowding or steaming. Preheat one zone hot, sear the seasoned steak to medium-rare, rest it, and slice it thin against the grain while the peppers and onions char in the beef fat.
How to make steak fajitas on a Blackstone griddle: the best cut, zone setup, sear timing, resting, and slicing against the grain for tender flat-top steak fajitas.
Substitutions
| Instead of | Use | Adjust | Expect | Avoid when |
|---|---|---|---|---|
| skirt steak | flank steak | — | Flank is leaner and a touch less tender but easier to find; slice it especially thin against the grain. | — |
Technique
Sear, rest, slice
Preheat the griddle hard and set a high searing zone and a medium holding zone. Pat the steak dry, season it, and oil the hot zone with a thin film of avocado or another high-smoke-point oil. Lay the steak down and leave it alone to build a crust, flipping once, until it reaches about 130–135°F for medium-rare — skirt and flank are thin, so this is only a couple of minutes per side. Move it to a board to rest while the peppers and onions char on the hot zone in the fond. Slice the rested steak thin across the grain, combine, finish with lime, and serve off warm tortillas from the medium zone.
The call: Sear hard on the high zone to 130–135°F, rest, then slice thin against the grain; char vegetables in the beef fat.
Recommended gear
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For slicing steak
VictorinoxModel 5.4233.30 (Fibrox 12" Granton)
Thin, even slices across the grain are what make skirt and flank tender. A long granton slicer does it in one clean stroke instead of sawing.
Best for: Clean, thin, against-the-grain slices on skirt and flank steak.
John BoosModel RA03 (24 x 18 in)
A roomy board with a juice groove lets steak rest and be sliced in one place; pour the caught juices back over the strips before serving.
Best for: Resting and slicing steak with room to spare.
ThermoWorksModel ThermoPop 2
You do not need a premium thermometer to cook safe chicken. The ThermoPop 2 is accurate and a few seconds slower — a great-value pick from the same maker.
Best for: A reliable read without the premium price.
Gear & how it works
Tools, batching, and cleanup
Two wide metal spatulas let you flip and gather; an instant-read thermometer keeps a thin steak from sailing past medium-rare, and a squeeze bottle plus a bench scraper keep the surface moving. Skirt steak in particular cooks so fast that a thermometer is the difference between tender and tough. On a 28- or 36-inch Blackstone you can sear two or three steaks and char a full load of vegetables in a single service; on a 17-inch, work in two quick batches and hold the first under foil. Scrape and re-oil the griddle while it is still warm to protect the seasoning.
The call: Two spatulas, a thermometer, a squeeze bottle, and a scraper; batch on a small griddle and re-oil warm.
Frequently asked questions
+How do you make steak fajitas on a Blackstone?
Preheat a high searing zone, oil it, and sear seasoned skirt or flank steak hard to about 130–135°F for medium-rare, flipping once. Rest it, char the peppers and onions in the fat, then slice the steak thin against the grain and serve.
+What is the best steak for griddle fajitas?
Skirt steak is the classic — richly beefy and quick to sear. Flank steak is a leaner, easy-to-find alternative. Both are thin, cook fast, and must be sliced thin against the grain to stay tender.
+What temperature do you sear steak fajitas on a griddle?
As hot as the griddle goes for the sear, roughly 500°F, and pull the steak at about 130–135°F internal for medium-rare. Because skirt and flank are thin, that is only a couple of minutes per side.
Testing, sources & disclosure
Researched and reviewed by our editors. See our recommendation methodology.
- Author:
- FajitaRecipe Editorial
- Last reviewed:
- 2026-07-12
As an Amazon Associate, FajitaRecipe.com earns from qualifying purchases. We do not provide medical or dietary advice; follow USDA guidance for food safety.
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