If using flank steak, follow same instructions.
If using chicken, pat dry and cut into 1” pieces. Season all over with 1/4 tsp. salt and a pinch of pepper. Follow same instructions as steak strips in Step 3, stirring occasionally until chicken reaches minimum internal temperature, 5-7 minutes.
If using shrimp, pat dry and season with a pinch of salt and pepper. Follow same instructions as steak strips in Step 3, searing shrimp undisturbed on one side, 2-3 minutes. Flip, and cook until shrimp reaches minimum internal temperature, 1-2 minutes.