Did you know that all the data in this online database (and a lot more besides) is available as part of the 'Vegetable Gardeners Almanac' software?
Cut the peeled eggs in half lengthwise. Remove the yolks and press (yolks) through a sieve into a bowl. Add to mayonnaise & sour cream mixture.
Put mixture into a piping bag (or use a plastic bag with a small hole in the corner). Pipe the filling into the hollow parts of the egg white. Garnish with a parsley or coriander.