1 pound (450g) beef tenderloin, skirt steak, or other tender and flavorful quick-cooking steak
1/4 cup (60ml) peanut, canola, or vegetable oil, divided, plus more if needed
Kosher salt
1 medium (8-ounce/225g) red onion, cut into 1/2-inch slices
4 scallions (about 2 ounces/60g total), roots and any wilted parts trimmed, remainder cut into 2-inch lengths
1 fresh or frozen ají amarillo chile pepper (about 2 ounces/60g), defrosted if frozen, then stemmed, seeded, and sliced lengthwise into matchsticks (see note)
2 medium plum tomatoes (about 5 1/2 ounces/160g total), cored and cut into 3/4-inch-thick wedges
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