To make beef gravy from the juices on the crockpot I combined 2 tbsp of butter and 2 tbsp of flour in a pan over medium heat. Stir together until the flour is combined with the butter and it starts to thicken. Cook for a couple of minutes and pour in the juice (about 1 1/2 cups) from the crockpot into the pan. Stir until it thickens and is gravy!