Whisk the soy with the sugar, vinegar, chilli and one teaspoon of sesame oil in a small bowl. Whisk to combine and place half in a wide dish, large enough to hold the steaks. Transfer the steaks to the marinade (leaving the pan on the heat) and allow to sit for 5 minutes, turning once or twice to coat all over.
Whilst they rest, return the pan back to a high heat. Toss the sweetcorn and spring onions in the remaining teaspoon of the oil and sear on the griddle pan for 4-5 minutes until charred on all sides. Tip into a bowl and toss with the carrot.
Remove the steaks from the marinade, slice, return to the dish and toss to coat in the dressing once more.