I was always a fan of gelatin. It’s fun how it teeters on the edge of being a solid and a liquid. You can slice it and scoop it but you can also slurp it off a spoon. When I was a kid my favorite thing was to put a big piece in my mouth and then squish it out through my teeth. I don’t do that anymore… as far as you know. The only part I hated was waiting for it to set up. There were always finger prints on the top from me poking at it.