Place 3 tablespoons oil in a large skillet over medium heat, add yuca cubes (or potatoes) and fry until golden brown on all sides.
In a large bowl, add beef, beets, any cooked vegetables desired, and dried thyme. Stir well to combine. If mixture looks a little dry, moisten with any leftover cooking liquid from the beef. Can also use beef broth or water.
Add mixture to the yuca or potatoes in skillet, stir well and allow to heat throughout. Spread evenly in pan and let a brown crust form on the bottom. Turn over to brown the other side.
Serve immediately with eggs and/or a salad and enjoy!