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1
Heat an outdoor grill to high (about 450 degrees F to 550 degrees F).
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2
Season the steak generously with salt and pepper and place it in a 13-by-9-inch baking dish.
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3
Place the remaining measured ingredients in a blender and blend until evenly combined, about 30 seconds.
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4
Remove 3 tablespoons of the marinade and set it aside for the relish.
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5
Pour the remaining marinade into the dish with the steak, turn the steak to coat, and let it marinate at room temperature for 30 minutes, flipping halfway through.
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6
Meanwhile, grill the peppers for the relish.
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7
Place the bell peppers on the grill.
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8
Cover the grill and cook, turning occasionally, until the peppers are blackened and blistered on all sides, about 25 minutes.
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9
Transfer the peppers to a large bowl.
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10
Cover tightly with plastic wrap or a large plate and let sit until cool enough to handle, about 15 minutes.
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11
Meanwhile, grill the steak.
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12
Remove the steak from the baking dish and let any excess marinade drip off; discard the marinade.
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13
Place the steak on the grill and season it generously with salt and pepper.
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14
Cover the grill and cook until grill marks appear on the bottom, about 5 to 6 minutes.
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15
Flip the steak and season generously with salt and pepper.
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16
Cover the grill and continue to cook until grill marks appear on the bottom and an instant-read thermometer inserted into the middle of the steak registers 125 degrees F to 130 degrees F for medium rare, about 5 to 6 minutes more.
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17
Transfer to a large, clean plate and let rest for 10 to 15 minutes.
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18
Meanwhile, finish the relish.
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19
Transfer the peppers from the bowl to a cutting board.
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20
Set the bowl aside, reserving any liquid inside.
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21
Use a knife to scrape and peel the skins off; discard the skins.
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22
Slice the peppers open and remove the seeds and membranes.
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23
Cut the peppers into medium dice and return them to the large bowl.
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24
Add the remaining measured ingredients and the reserved marinade and stir until evenly combined.
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25
Taste and season with salt and pepper as needed.
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26
Thinly slice the steak against the grain, season it with salt and pepper, and serve with the bell pepper relish.