For ground beef to stay tender and moist while cooking in the crockpot it will need some liquid. This can be in the form of sauce, broth, water, or other liquid.u003cbr/u003eu003cbr/u003eIn this taco meat recipe made in the slow cooker, the liquid is the tomato sauce. However, the ground beef also stays juicy and moist because of the bread and milk panade that we use.