Slice flank steak against the grain.

In a bowl, mix together ingredients for the marinade. Add sliced beef and mix until coated. Let marinade in the fridge for 30 minutes.

Slice onion and spiralize zucchinis.

In a mixing bowl, add soy sauce, coconut sugar, ginger powder, chilli powder, garlic powder, cornstarch and water. Mix until combined.

Heat up 1 tbsp oil in a large nonstick skillet over medium heat. Add onion and stirfry for 1 minute.

Increase heat to high, add marinated beef and let sear until golden brown, about 1-2 minutes.

Remove beef from heat and transfer to a plate.

Reduce heat to medium and add the soy sauce mixture. Cook for 1-2 minutes or until it has thickened to the consistency of syrup. Add beef and spiralized zucchini to skillet and stir. Cook for 1 minute or until zucchini is cooked to desired doneness.

Remove from heat and serve immediately. Garnish with sesame seeds. Enjoy!