Hi Elle,
Looks pretty good. Will you use some other props or visual aids? Because you won't be able to use real rice ...
You could try changing some of your connectors to be more interesting. EG: instead of saying "Then, add mushroom ..." you could say "Once the ingredients are well-mixed, add mushrooms ..."
Otherwise just make sure it takes about 5 minutes to present (will this take that long?), and try to memorise as much as possible, so that you can look at your audience.
Good luck!
Patrick