MIX sauce ingredients in a small bowl and set aside.
HEAT avocado oil in a deep pan or wok over medium heat. Add ginger, garlic, chilis, and the white parts of the green onions. Fry for 30 seconds.
ADD tempeh, along with any remaining marinade, and cook for 1 minute.
ADD chopped veggies and cook briefly until crisp-tender.
GIVE the sauce a quick stir then pour into the pan. Toss to distribute the sauce.
ADD in peanuts and ground Sichuan peppercorns (if using). Toss a few times to coat evenly, then turn off heat.
GARNISH with cilantro and the green parts of the green onions, and if you’d like, you can serve kung pao tempeh with cauliflower rice or in lettuce cups.