If they were all steamed buns with sweet beans, that would be perfect.
It would be better if they were all Anman.
全部あんまんがいいけど、実際はそうではないので、この場合は次のように言うと良いですよ。
ーIf they were all steamed buns with sweet beans, that would be perfect.
「全部あんまんだったら最高なのに」
steamed buns with sweet beans で「あんまん」
ーIt would be better if they were all Anman.
「全部あんまんの方がいいのに」
ちなみに肉まんは英語で
Chinese steamed buns with meat
と言います。
ご参考まで！
カナダ 
