Question

Do you want to go to the/ a/an restaurant where we first met?​

Answer 1

The, т.к далее в предложении поясняется какой именно ресторан (в котором впервые встретились)

Answer 2

It depends on the context of the question. If the person asking wants to go to the restaurant as a romantic gesture or as a way to reminisce about the first meeting, then the answer would depend on the individual's feelings towards the restaurant and the memories associated with it.

If the person has positive associations with the restaurant and feels nostalgic about the first meeting, they may be open to the idea of going back. On the other hand, if they have negative feelings or if the restaurant holds no special significance for them, they may not be interested in revisiting it.

Ultimately, the decision to go to the restaurant where the first meeting took place would depend on the individual's personal feelings and experiences related to that location.