Shona Moong Daal is a type of yellow split pea that is smaller and of better quality. It costs more than a regular yellow split pea and in Bengali cooking, we use it frequently. In Delhi, I have seen this daal available in C R Park. I am sure in other Indian cities, Shona Moong Daal will be available in Bengali stores and outside of India, you can try Bengali stores. If not available, try a smaller variety of moong dal, preferably the best quality available.