Trim the base of each endive head and gently separate the leaves. Rinse the leaves under cold water, pat dry with paper towels, and set aside.
Place the thinly sliced smoked salmon on a cutting board and cut each slice lengthwise into narrower strips suitable for rolling.
Roll each salmon strip tightly from one end to the other to form small rosettes.
Arrange the salmon rosettes in the center of a round serving platter.
Fan the endive leaves around the salmon rosettes, shaped like petals with the concave side facing up.
Using a one-teaspoon cookie disher or a 1-teaspoon measuring spoon, scoop rounds of creme fraiche and place one round onto each endive leaf.
Drain and, if desired, pat the capers dry. Sprinkle the diced red onion and the capers evenly over the salmon and endive arrangement.
Serve immediately with bagels or sliced baguette.