A couple of days ago I made a first attempt at dessert sushi. Everything went reasonably well except for the salmon roe which I'd planned to make from orange jello. I made my own mould from plasticine covered in plastic wrap and imprinted all over using a small plastic sphere. This didn't work out; the wrap burst in several places; the jello clung to the wrap too well and the few jello 'eggs' that came out in one piece were only half spheres.

Granted that some of these problems are surmountable, the last problem of producing a perfect sphere is, for me, a conundrum. Does any one have any better ideas?