ルーシー、どう? おいしい? 買ってみる?
Lucy, what do you think? ^Is it [Are they] good? Do you want to get it [them?]

 うん! おいしいよ!
Yeah! It's [They're] good!

 分かった。じゃあ買おう!
OK. Then let's get it [some].

 この店、試食がたくさんあるから好き。
I like this store because they have a lot of food samples.

 トミー、これ一緒に食べよう。
Tommy, let's share [eat] this together.

 味見させてよ。
Let me have a bite. / Let me taste it.