I think in the future, I would try a dab of goat cheese in place of the sour cream.
salt and fresh pepper, to taste
1/4 cup balsamic vinegar
zest of 2 oranges
1/4 cup sour cream
a few cilantro leaves
Coarsely chop beets and add to food processor; pulse until finely chopped but not pureed.
Transfer beets to a bowl. Stir in vinegar, 1/2 of orange zest and salt and pepper.
Serve on endive leaves with a dab of sour cream, a cilantro leaf, and sprinkle with remaining orange zest.