Doubledog, most vegetarian and vegan fare doesn't have "meat substitutes" in it. Something isn't a meat substitute just because Westerners don't usually eat it unless it's out of dietary consideration. Tofu has nothing to do with mimicking meat 90% of the time. I will grant you there are some baffling meat substitutes out there, like tofu dogs, which are bland and soft and I hate them, but they've mostly been foisted on me by well meaning non-vegetarians who think that's what I eat. For the record, you can get these really great veggie sausages made from potatoes and eggplant that have an amazing texture. Basically imagine eating sausage and never hitting a tiny bit of bone. No one ever said the texture of chicken or sausage was bad.
For instance, the vegan paella I mentioned above is made with wheatberries and chickpeas--it did not need chicken, real or fake. I also made vegetarian lasagne once until I realized it was basically just eggplant parmesan with pasta in it and now I just make eggplant parmesan, because eggplant is amazing. My boyfriend and I also make a lot of curries with potatoes, carrots, zucchini, lentils, and/or yams. We also make a lot of pasta with squash. We also use a lot of quinoa, rice, and orzo. I have cooked with tofu a grand total of twice in the last two years, but it looked like a block of tofu, because tofu is its own thing.
You can't make tofu feel like chicken the way you can with seitan, because tofu is made from soybeans and seitan is made from strands of gluten. I like seitan for the texture, which you can't get from a portobello mushroom, which isn't to say I don't order portobello sandwiches when I go out to eat, because I do. Tempeh is really, really good, too, and you should try it sometime, but the Indonesians didn't come up with it to replace chicken, beef, or fish. And again, I've eaten seitan a total of twice
ever. Here's a link to the wikipedia page about seitan:
https://en.wikipedia.org/wiki/Wheat_gluten_(food)
If you really want to see how most vegetarians eat, here's a link to the
Vegetarian Times. You'll see a lot of whole fruits, vegetables, and assorted legumes, nuts, and grains.
As for the mushrooms turned into sesame "chicken," the reason it was better than real sesame chicken was that it was nothing like chicken. The chunks of "meat" had a crisp, chewy outer shell with the thick sesame sauce slathered on it, and a slightly stringy but not at all gamey interior. It was heaven.