While squash is cooking, prepare kasha. Kasha is the buckwheat grain toasted before cooking. Put buckwheat in a saute pan over low/medium heat and 'toast' until slightly browned or fragrant. In a saucepan, put 1cup of water to every 1/2cup grain. Bring to a boil then cover and simmer 10-15min, until all water is absorbed. (Feel free to use a vegetable broth, or season the water as you wish.)