Heat a large skillet over medium high heat and add vegetable oil.
Add the bell pepper, white onion and garlic to the skillet and cook for 2 minutes. Then add the carrots, radishes and broccoli and cook for an addition 3-5 minutes or until carrots begin to soften.
Add the crumbled tempeh to the skillet and cook for 3-5 minutes or until tempeh begins to brown.
Meanwhile, in a small bowl whisk together the hoisin sauce, rive vinegar and sesame oil.
Turn the pan down to low heat, and pour the sauce into the pan. Cook for 2-3 minutes until the liquid begins to boil.
Remove from the heat and add any of the optional toppings.