For the Mexican Pork Carnitas: If planning to prepare the recipe again in the future, strain the cooking manteca or oil through a fine sieve or cheesecloth to remove any debris. Transfer to a container and hold in the fridge for up to 90 days. Use this as the base cooking oil for the new batch, not new manteca or oil. This will add depth of flavor to the next batch of carnitas. Repeat for every batch. For the Mexican Rice: Check the moisture level of the rice at 10 minutes of covered cooking. Add 1/4 cup water if needed.