In a large bowl, add the cubed tempeh, corn starch, olive oil, rice vinegar and soy sauce. Mix to combine.
In a small bowl, combine dark soy sauce, soy sauce, maple syrup, and mushroom stock. Set aside.
Heat a large pan over medium heat and add another 2 tbsp of olive oil. Warm oil for 30 seconds and then add the cubed tempeh. Cook for 2-3 minutes to allow the tempeh to get crispy. Flip and cook for another 5 minutes to get golden brown all over.
Stir in the sauce, it will start to bubble. Stir to combine and prevent the sauce from burning. Allow the sauce to reduce until thick. This should happen in a minute or two. Continue to stir so it doesn’t burn. Add garlic and ginger and stir to combine.
Top with chives, serve with rice and dig in!