Arrange the cut halves of a bagel (toasted if desired) on a plate or board. Spread each half with cream cheese.
Layer with lox, avocado, cucumber, red onion, and hard-boiled egg slices. Sprinkle with capers, salmon roe, herbs, and bagel seasoning if desired. Serve with lemon wedges.
Notes
Bagels: Plain, wheat, sesame seed, poppy seed, and everything bagels are all good choices.
Cream cheese: For the easiest spreading, buy a tub of whipped cream cheese. Or, whip regular (block) cream cheese in a mixer until fluffy.
Lox: This salmon has been cured like smoked salmon (in a salt or brine mixture), but not smoked. Substitute smoked salmon if you prefer that.