Fresh rice noodle sheets can be found in stores that specialize in Chinese ingredients. If you can’t find them fresh, rice noodle sheets in 1-pound blocks are available in the freezer section of Asian grocery stores. Defrost frozen noodle sheets overnight in the refrigerator to prevent them from cracking. To prepare them, defrosted until they’re just firm and cut the sheet into 1/2-inch-thick strips. Place the strips on a microwave-safe plate, microwave on high in 30-second intervals until just hot enough to separate each piece, about 1 minute. Separate the noodles into individual strands. Fermented black soybeans, sometimes called salted black beans or preserved beans, can sometimes be found in grocery stores specializing in Asian ingredients or ordered online.