Heat olive oil over medium heat in large skillet or pan.
Once oil is heated, toss in onion, zucchini, bell peppers, and any other vegetables and cook until tender.
After vegetables are fully cooked and tender, add sliced sausage and pineapple chunks (reserving juice), and stir until both are heated throughout.
In a small bowl, whisk together soy sauce, reserved pineapple juice, and brown sugar. Add sauce to pan and bring to a simmer, stirring often to coat sausage and veggies.
Once sauce is bubbling and all ingredients are heated throughout, add brown rice to the pan, stir to mix, and garnish with sesame seeds