In a small bowl, add the mirin, soy sauce, sake, brown sugar, and the green part of 1 Spring Onion until combine. Set aside.
Cut chicken into 1 inch cubes. Marinate with some salt and pepper for extra flavour.
Heat cooking oil in a large pan over medium heat. Stir fry chicken, stirring occasionally until lightly browned and crisp.
Add the garlic to the centre of the pan and saute until lightly fragrant (about 30 seconds). Pour in the sauce and allow to cook, while stirring, until the sauce thickens into a beautiful shiny glaze (about 2-3 minutes).*
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