This restaurant mirrors a general problem encountered in MÜrren. The problem of staying in Mürren is that dinner is a matter of some few restaurants in this place on the top of the firs line of mountains, inaccessible to cars. If you do not like restaurant prices in comparison to food they offer, maybe it is better to go down with the mountain train (careful with the timetable) to the close villages (if you have left your car there Lauterbrunnen, Grimmelwald or, why not, to Interlaken) and you will be surprised by the difference in prices and quality. If you remain in MÜrren in the evening, and if there is no train to go down from the mountain of Mürren, you are "trapped" and you need to choose one restaurant. This La Grotte is maybe the less harmful choice, compared to the prices we have seen at the entrance of the other "restaurants"
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.