In the same pan, drain the oil. Pour in the lemon juice, brown sugar, sherry vinegar, soy sauce, and five spice powder. Bring the mixture to a simmer and let it reduce and thicken over medium heat. Once the mixture thickens, place the tilapia back in the glaze and let it simmer for a minute. Make sure to cover the tilapia with the sauce. Turn heat off and Serve over rice or with salad on the side.