Combine the brown sugar, sesame oil, soy sauce and peanut butter in a bowl. Whisk to combine and set aside.
Heat the oil in a skillet over medium heat. Add the tempeh and cook for 3-5 minutes, or until the pieces start to brown. Add in the onion, bell pepper, garlic, ginger & whites of the green onion and cook for another 3 minutes.
Pour in the sauce and allow it to simmer over medium-low heat for 5 minutes.
Before serving, add in the peanuts, lime juice & cilantro. Toss, taste and adjust any seasonings.
Serve over rice with the remaining green onion and lime wedges on the side.
Calories: 396kcal, Carbohydrates: 40g, Protein: 18g, Fat: 20g, Saturated Fat: 3g, Polyunsaturated Fat: 7g, Monounsaturated Fat: 8g, Trans Fat: 0.01g, Sodium: 624mg, Potassium: 546mg, Fiber: 3g, Sugar: 6g, Iron: 3mg