This recipe uses just four ingredients to make a moist and rich pumpkin cake. Remove the seeds from a pumpkin, cut it, and heat it in the microwave, then separate the skin from the flesh. Add sugar, milk, and egg to the pumpkin flesh and blend until smooth. Pour into a heat-resistant container and heat again in the microwave. Once it has cooled slightly, refrigerate until firm. It's easy to make using only a microwave and no stovetop, making it perfect for beginners.