In a small bowl, combine the cream cheese, lemon juice, fresh dill and salt and pepper, to taste.
Toast the bagels, then spread the cream cheese mixture on one or both sides of the bagel. Add the cucumbers, smoked salmon, capers and red onions on the bottom of the toasted bagels. Top with the top of the bagels.
Video
Notes
Storage: This is best enjoyed as soon as it is made, but will keep, covered well, in the fridge for 24 hours.