Lightly toast the sourdough bread.
Spoon the scallion cream cheese onto the toasted sourdough instead of spreading it flat, creating small pockets for the capers.
Add the capers over and between the spoonfuls of cream cheese.
Layer the smoked salmon over the tartine in large torn pieces so it is easier to bite into without pulling the entire slice apart.
Finish with the thinly sliced shallot and fresh dill.
Drizzle with good-quality olive oil just before serving for that rich, savory finish that gives this tartine its NYC café vibe.