Caramelised Onion And Gruyère Tart

I made this cheese and onion tart exactly as was indicated in the recipe. I think however that there was a fault in the ingredients as were given. The pie crust did not come out as I had hoped because as I always do with my quiches: I saw there was no butter in the crust and the result was very disappointing. The pie itself was not excellent, I would have used crème fraîche instead of milk. I will not make this tart again like indicated in this recipe. Pity!