There are those that eat two Seudos on Erev Yom kippur and those that eat only one. What is the source of eating either 2 or 1?
One must eat at least the seudas Hamafsekes.
- There is a largely accepted minhag to eat two seudos Erev Yom-Kippur: one in the morning and one in the afternoon.
- One should eat meat for the Seudas Hamafsekes. There are those that eat Dairy for the morning meal, but many are noheg to eat meat for both.
No one discusses a minhag to HAVE a morning meal in addition to the Seudah Hamafsekes. The discussion is having meat at your pre-existing morning meal. The assumption is that you ALWAYS have a morning meal. Some call this "breakfast." The assumption is that you sit for this meal and have bread always (Pas Boker). In the times of the Rishonim people didn't simply grab a coffee and a yogurt on the way to the train station.
i am sorry but is a know an also published minhag to eat two meals. Not a breakfast but just before mincha (starting before chatsot).
In the books I did read about this they write to eat fish in the first meal and meat in the erev Jom kipur meal. I also I understood that the two meals are for the two Jom tov meal. one says because erev Jom Kipur is like a Jom Tov and another says it are the Jom Tov meals for Jom Kipur. I think they add up to the same.
I am not with mine sforim so I can not check the place so I will not bring it. On the Internet I did found the following places. The first two I know as reliable the 3th I was not able to post.