Cut the tempeh into 1/2-inch cubes and steam them for 10 minutes to remove any bitterness and soften the texture.
In a small bowl, whisk together the coconut aminos, tamari, rice vinegar, maple syrup, grated fresh ginger, and minced garlic to create the stir-fry sauce.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the steamed tempeh cubes to the skillet and sear for 5-7 minutes, turning occasionally until all sides are golden brown and crispy.
Add the broccoli florets and sliced red bell pepper to the pan, stir-frying for 3-4 minutes until the vegetables are tender-crisp.
Pour the sauce over the tempeh and vegetables, tossing constantly for 1-2 minutes until the glaze thickens and coats everything evenly.
Remove from heat and stir in the toasted sesame oil, sea salt, and black pepper.
Garnish with sesame seeds before serving warm in a bowl.