The sentence translates to: "The lamb here is very delicious, but it is also very ( )."
Looking at the context and the options provided (A: very, B: meaning, C: from, D: to give, E: expensive, F: outside), the most logical word to complete the sentence is 'expensive'.
Therefore, the completed sentence is: 这儿的羊肉很好吃,但是也很贵。
Answer: E