I'm thinking of making some very Danish Smørrebrød, open-faced sandwiches. Pickled herring, those little shrimp, gravlax, chopped onion, chives, dill, thinly sliced cucumber, the works. I've visited Copenhagen many times, and am familiar with typical Smørrebrød, but have never made them myself, so don't know where to find the speciality goods, and what brands to use (especially pickled herring, little shrimp, and coarse, dense bread). I don't want to end up with half-used jars of bad pickled herring (ew). Any suggestions?