For a richer flavor, consider adding a teaspoon of sesame oil along with the canola oil. Feel free to substitute or add other vegetables such as bell peppers, snow peas, or zucchini. To toast sunflower seeds, spread them on a baking sheet and bake at 350°F (175°C) for 5-7 minutes, or until lightly golden. Adjust the amount of soy sauce and water to your preferred level of saltiness and sauce consistency.