1. Heat oil in a large skillet on medium high heat. Add onion and cook, stirring until it begins to brown. Lower heat to medium, add garlic and stir one minute until fragrant. Do not allow garlic to brown. Add zucchini, bell pepper and corn. Stir, cover and cook until vegetables begin to soften, about 10 minutes. 2. Uncover, add jalapeno pepper, tomato, and cumin. Cook uncovered, until vegetables are very tender, 15 to 20 minutes. Season to taste with salt and pepper. Stir in cilantro. Serve warm or at room temperature.