The mushroom is a speciality here./蘑菇是这里的特色菜。

A: I'm going to choose some different vegetables.

A: 我要选几样蔬菜。

B: Great.  I really like vegetables here in Beijing.

B: 好极了！我非常喜欢北京的蔬菜。

A: Now the mushroom is a speciality here. Do you like mushrooms?

A: 这个时候蘑菇是这里的特色菜。你喜欢蘑菇吗？

B: Yes, I do. And I really like bamboo shoots.

B: 是的，我喜欢。我还非常喜欢吃竹笋。

A: Good! This dish here with bamboo shoots is another speciality.

A: 好！带竹笋的菜是这里的另一特色菜。

B: Can we also order some vegetable spring rolls?

B: 我们还可以点一些蔬菜春卷吗？

Notes 注释

1. At a restaurant, you may want to point out the specialities to a guest: For example, mushrooms and bamboo shoots: The mushroom is a speciality here.  / The mushroom is a speciality here. / This dish, with bamboo shoots, is another speciality. / This dish, with bamboo shoots, is another speciality.
在餐馆里，你可能想给客人指出那里的特色菜：例如，蘑菇和竹笋：The mushroom is a speciality here.  /蘑菇是这里的特色菜。/ This dish, with bamboo shoots, is another speciality. /带竹笋的菜是这里的另一特色菜。

2. To show your appreciation¹, you can say: I really like bamboo shoots. / I really like bamboo shoots.
要表示感谢，你可以说：I really like bamboo shoots. /我非常喜欢吃竹笋