If you do not have a wok, but love Chinese food, it is probably one of the best cooking investments you can make. It gives you the peace of mind that no animal products are mixed into your dish (which makes some vegans wary of chinese food places). You can also find all kinds of recipes online so you can re-create take out at home.
This stir fry is with spinach, broccoli, and tofu in soy sauce and sesame oil.
If you prefer a thicker sauce, then you can add corn starch.