Well, the quality of any food depends on its preparation and seasonings.
I've not have enough caviar to have an honest opinion.
Tofu can be very good. It can build body and nutrition into many baked goods and shakes. I bet you I could make some tofu/soy recipies that you would never notice it contains tofu.
Rice Pilaf is a tricky one. Most of the whip together pilafs lack flavor. A good rice pilaf will have a medley of flavors from the vegetables, spices, stock (broth), and good rice iteself (use brown or jasmine/basmati rice).
My idea pf the most worthless food are vegan products that are trying to replicate meat/dairy/egg products and are trying to taste like them. Many good soy/bean/vegan foods are out there that are very enjoyable in their own right (my sister is allergic to dairy, and so I have tried a range of dairy replacement products when eating with her.) However, don't make them into something they are not.
