Prepare jelly according to the description on the package. Pour into forms a layer of about 1.5 cm. When well hardens, dip the form for a few seconds in warm water (to jelly backwardly from the edges of the shape). Cut jelly cubes, mix 3 colors. Whisk sour cream with sugar (to dissolve sugar). In a small (100 gr.) the amount of water dissolve the gelatin and add to cream. Beat well.

In the form pour half of the sour cream, then put the cubes of jelly and cover with second half of sour cream. When well hardens, dip the form into warm water and turn the jelly on a dish.