Begin by toasting the bagels until golden brown.

While the bagels are toasting, mix the softened cream cheese with the lemon juice, dill, salt, and pepper in a small bowl until well combined.

Once the bagels are toasted, spread the cream cheese mixture generously on each half.

Layer the smoked salmon on top, followed by capers and slices of red onion, and assemble the halves together just before serving for maximum freshness.