Cut the zucchini in half (lengthwise) and scoop out ⅔ of the flesh, leaving a ½-inch (1 cm) thick border around the skin. Chop the scooped-out zucchini with a knife and set it aside.
Meanwhile, heat oil in a skillet over medium heat. Add onion and sauté for about 4 minutes.
Add garlic, bell pepper, zucchini flesh, the spices, soy sa