Can we use the coconut that was offered to Perumal at temples or at home in the preparation of food? Can we offer that cooked food to Perumal?

Some, a few elders, use the coconut that was offered to Perumal in cooking and they offer the same to Perumal. If we desiccate the coconut, offer it to Perumal, and partake in the same, then on the next day the same coconut cannot be used for cooking.
Notes:
Generally, two separate foods are prepared one with coconut and one without coconut; after offering the food without coconut to Perumal, both foods are mixed. This is one subtle method.