I recently heard from two separate people about a custom not to eat any meat at the Seder (i.e. only fish and chicken are eaten). This was surprising to me, as the minhag mentioned in the Mishnah, Gemara and poskim refers specifically to roasted meat. Does anyone have information about this?
Taz (Orach Chaim 476:2) mentions such a custom. The people who did so were concerned that any kind of meat might be confused with roast (and as YS noted, the Ashkenazic custom is indeed not to eat roast meat at the Seder).
However, he understands Tur to be saying that it is improper to do so, because the joy of Yom Tov includes eating meat; the best approach, he says, is to eat cooked meat and not worry about any possible confusion.
Dutch jews have a dairy meal at their seders.
IIRC, Ashkenazim have a specific custom not to eat lamb at the seder. (For fear it would be confused with a real korban pesach.)
Many Sephardim specifically eat lamb or goat during the Seder as a remembrance.
One may not eat roast at the Seder since the custom is not to eat any roast meat then (Shulchan Aruch Orach Chayim 476:2).
I never heard of such a custom. Perhaps it is related to the old Ashkenazic custom to not use red wine because of the blood libels. Maybe they were concerned of being accused of cannibalism.
See Alex's answer for the correct answer. Mine was just a theory that seems to be wrong.
I am Sephardi of Spanish origin and my family minhag is to eat oven-roasted lamb and rice for the Seder. Rabbi Dr. R.M. Saloman, Jerusalem.