The creation of such a thing needs to be thought up by yourselves, trial and error perhaps! Once you've had an attempt at creating the physical model you could post the model here and then seek improvement advice. As for material, well it's for food preparation so the material needs to be both hygienic and able to take the influences of heat. Just go and look in the kitchen and see what other cooking items are made from!
If you really want help, that's fine, but very few people in the forum will give you your project on a platter! We help those who show that they are helping themselves. Attach what you have so far!
It may be much better/easier to have a removable perforated liner??
But as Dave said....
you wont get much help here without trying for yourself first.
Please give some contact information for your instructor. I wish to contact him directly and request some more specific instruction for your class about what this forum is for.
It is not for general design help, material selection, or homework. It is a SolidWorks forum for people who have SolidWorks questions.