Preheat oven to 325 degrees Fahrenheit.
Add the olive oil to a Dutch oven and fry the beef tendons over medium-high heat. Sear all sides until they begin to brown. Add all of the spices and let cook for one minute. Add the vegetables and let cook for an additional five minutes.
Begin slowly adding the broth, scraping the bottom of the pot. Continue adding the broth and the soy sauce until the tendons are fully submerged. Bring the liquid to a boil, then transfer the Dutch oven to the oven.
Cook the tendons for about 6 hours or until soft. Add more water, as necessary, to keep the tendons fully covered.