Cook the sweetcorn in boiling water for about 10-14 minutes. Drain and let it cool. Rest in the fridge until needed.
Cut the sweetcorn in half.
Mix the oil, Teriyaki sauce and lime juice. Add the chilli flakes, if used. Brush the sweetcorn with the marinade and put them on a plate. Rest until you’re ready to grill them (keep brushing them with the marinade).
Heat your BBQ or griddle pan. Whet hot, add the cobs and cook until lightly charred while brushing them regularly with the leftover marinade.
Serve warm or at room temperature, drizzled with lime juice.