Prepare rice as above, but do not add parsley and pistachios. Refrigerate in a sealed plastic bag up to 2 days. Just before reheating, while it’s still in the bag, use your hands to break up rice clumps. Turn into a microwave dish and microwave on medium-high, stirring halfway through, until warm, from 8 to 10 min. Stir in pistachios and parsley.