Fajita Vegetables on the Grill: Smoky Peppers and Onions
Grilling gives fajita peppers and onions a smoky char you cannot get indoors, but the grate is also the easiest place to lose them into the fire. The trick is to grill them in large planks first — whole pepper sides and thick onion rounds — over direct high heat, then slice them into strips afterward, so they get real char without falling through. This guide covers the plank method, a grill basket alternative, and how to time them with the meat.
How to grill fajita vegetables: grill peppers and onions in large planks over high heat, then slice, for smoky char without losing them through the grate.
Technique
The method
Heat the grill to high, direct heat and clean the grate. Cut bell peppers into large flat planks and onions into thick half-inch rounds, pushing a toothpick or short skewer through each round so the rings stay together on the grate. Toss lightly with oil. Lay them skin-side down and grill without moving them until the pepper skins are blistered and blackened in spots and the onions are deeply marked and softened, turning once — roughly six to ten minutes total. Pull them, let them cool just enough to handle, then slice the peppers and onions into fajita strips. Toss with salt and lime and combine with the grilled meat.
The call: Direct high heat, skin-side down, toothpick the onion rounds, char 6–10 minutes turning once, then slice.
Recommended gear
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For grilled fajitas
OXOModel Good Grips 16" Grilling Tongs
Sixteen-inch tongs keep your forearm out of grill-flare range while you turn skirt steak over direct heat.
Best for: Turning steak and chicken over live fire.
WeberModel 7681
A basket keeps pepper strips from falling through the grate while still letting them pick up direct-fire char — just do not overfill it.
Best for: Grilling sliced peppers and onions without losing them through the grate.
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.
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.
For warm tortillas
A damp-cloth warmer steams a stack soft in the microwave and keeps them pliable through dinner — the difference between a taco that folds and one that cracks.
Best for: Warming a stack quickly and keeping them soft at the table.
VictoriaModel COM-113 (12 in)
A dry comal over medium-high blisters tortillas in seconds, giving them the toasty spots a microwave never will.
Best for: Charring tortillas directly and toasting them the traditional way.
Timing with the meat and using a basket
Grill the vegetables alongside or just before the meat, since both want the same hot, direct fire — the vegetables can rest and stay warm while the meat finishes and rests. If you would rather skip the plank-and-slice method, a perforated grill basket or a grill-safe cast-iron pan lets you cook pre-sliced strips right on the grate, tossing them like a stovetop sauté but with smoke; it is faster to prep but gives a little less deep char than direct planks. Either way, keep the heat high and resist crowding, because even over fire, a crowded basket steams the vegetables instead of charring them.
The call: Grill vegetables with or just before the meat; a grill basket or cast-iron pan handles pre-sliced strips with less deep char.
Frequently asked questions
+How do you grill vegetables for fajitas without losing them?
Grill them large — cut peppers into flat planks and onions into thick rounds held together with a toothpick — over direct high heat, then slice them into strips after they come off. Or cook pre-sliced strips in a perforated grill basket.
+How long do fajita vegetables take on the grill?
About six to ten minutes over direct high heat, turning once, until the pepper skins are blistered and blackened in spots and the onions are deeply marked and softened. Then slice and season.
+Should you grill fajita vegetables or cook them on the stove?
Grilling adds a smoky char you cannot get indoors and is ideal when the meat is already on the grill. The stove or a griddle is faster and easier for weeknights. Both want high heat and no crowding for real char.
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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Grilling adds smoke and open-flame char that a pan cannot. Build a hot fire, grill skirt or flank steak directly over the coals to medium-rare, and lay the peppers and onions in a grill basket alongside so they blister at the same time. Rest the steak, slice it thin against the grain, and serve from warm tortillas. The whole cook takes only minutes once the grill is ripping hot.