I experienced the same once flying from FRA-IAD. I was told by an FA it's because the nuts come from the states and sometimes they don't fly enough over to Europe, in which case the European caterers provide them and they're different. I don't think we need to worry about sesame crackers getting mixed up with our warm nuts. Not yet at least. I do hope that rch4u is right though and the appetizer plates come back. Although, I did have a fairly decent salad on Wednesday on my FRA-IAD flight in C.