Many people eat Kreplach on Purim, Erev Yom Kippur, and Hoshanah Rabah. These 3 days are considered like hidden Yomim Tovim, as work is technically allowed. They are also days that we Klap. On Purim we Klap the Gragger. On Erev Yom Kippur we Klap Al Cheit. On Hoshanah Rabah we Klap Hoshanos. Most people use a outside dough with a chopped meat filling.
Question #1 - Does anyone know of any other reasons that we eat Kreplach on these days?
Question #2 - Does anyone have a Minhag to eat Kreplach on any other days?
Question #3 - Is there any other type of Kreplach that people eat?