Combine the sesame oil, lime juice and chilli and pour over the octopus. Set aside to marinate for 1 hour.
Heat a grill pan to hot and char grill the octopus for 3 - 5 minutes until cooked through.
Combine the dressing ingredients.
Arrange the watercress and tomato on individual plates with the grilled octopus on top.
Drizzle with dressing and serve.
Note: As a source of protein, octopus equals red meat yet provides double the amount of iron and similar quantities of zinc. It's also significantly lower in fat with almost no saturated fat.
Makes 4 servings