Combine all ingredients for the marinade, except for the cornstarch and add in the thinly sliced ostrich meat.
After 10 minutes stir in the cornstarch.
Heat 1 tbsp of olive oil in a large non-stick pan over medium high heat.
Cook the ostrich in a single layer, in batches, for a minute on each side. Then, remove and set aside.
Heat the remaining oil over medium high and add the stir fry ingredients: garlic, carrots, green onions, mushrooms and mange-tout and stir for 2-3 minutes.
Add the sauce ingredients- soy sauce, sugar, water, chilli flakes, and the reserved ostrich, stirring to combine.
Cook for a minute for the sauce to thicken before taking off the heat.
Serve with jasmine/fluffy rice.