To make up for that, here's the best food my ancestors managed to come up with:
Sushi Rice
2 cups of uncooked short grain rice
2 cups of water
45ml of Japanese rice vinegar(or apple vinegar will also work)
7 1/2 tsp of sugar
2 teaspoon of salt
Wash the rice and rinse thoroughly.
Put washed rice and water into rice cooker.
Mix vinegar, sugar and salt and stir well until dissolved.
Transfer cooked rice to a mixing bowl and sprinkle the vinegar mixture evenly over the rice.
Use a spatula to fold in the mixture into the rice, do not stir.
Leave to cool before making sushi.
For the filling, according to your preference but the more common ones will be cucumber or crabmeat (Use something that is slightly more on the solid side and would not spoil fast).
Lay a piece of nori on a sushi mat.
Spread the cooled rice on the nori.
Add the filling on top and roll tightly.
Then cut into desired length.
Here's a video I found on how to roll sushi.
http://www.youtube.com/watch?v=w8Qpo4G42_A&feature=related
Here's what it should look like when it's done.
Its easy to eat, easy to bring around, it looks exotic and refreshing and it's really easy to make. ^^