Here’s a lively stir-fry with Southwestern/Mexican flavors. The tempeh absorbs a soy-lime flavor as it simmers, and is livened up with bell peppers, zucchini, cilantro, and chili peppers.
In a small bowl, combine the stock, soy sauce, and lime juice. Stir together.
Set a large skillet or stir-fry pan over medium heat. Add about half of the oil, ¼ cup of the stock mixture, and the tempeh. Turn up the heat and stir-fry until the tempeh is starting to brown on most sides, about 10 minutes. Pour in a bit more of the stock mixture to keep the skillet moist. Remove from the pan and set aside.
Add the remaining oil to the pan. Add the onions and cook over medium heat until translucent, 2 to 3 minutes. Add the garlic, chiles, and red bell peppers and continue stir-frying for two minutes more.
Add the zucchini and tempeh and stir-fry about one minute. Add the remaining stock mixture.
Cover and cook for several minutes, stirring occasionally, until the vegetables are just tender and the liquid absorbed. Serve immediately (on or with hot cooked rice, as suggested in the headnote), garnished with the cilantro, and avocado if desired.