Creating procedurals is a question of try, try, try.

A sample for the lemon (this one were created from 2 spheres and 1 terrain):

For the bumps, select NOISE(smooth)
For the filter select ROUND CLIP 95% cubic and its gain to 0.150
Then right-click in the bumps window and select EDIT FUNCTION. There, reduce the scale X,Y and Z to 0.30.

Hope this helps.
Guitta