I thought this was wonderful, my family scarfed it up. I forgot the dill, honestly I'd probably omit it in the future since we loved it so much and dill isn't always one of my favorite flavors. I also added 2T apricot preserves to the mustard/creme fraiche mixture. Very, very nice sandwich. I'm not much of a pickle girl, but the entire combination just worked. Highly recommend.
Delicious sandwich - we've done this one a few times now and it just keeps getting better. We have substituted the creme fraiche with feta cheese with success.
BEST. SANDWICH. EVER. Perfectly tangy, juicy and delicious. Full props.