There’s a ton of mushrooms and fabaceae, very cheap nutritious and as much delicious if you learn to cook them well (like meat). My favorite is Tempeh which combine both! And quite cheap if you make it yourself.
They usually prep it in advance, so it’s rare to find one that has an actually vegan dish they don’t custom make even if it says tofu.
You could go vegan.
There's many "educational farms" to show kids live farms animals and sometimes pick the eggs and milk a cow. I'm very confused about them: it's good to let urban kids see-smell-touch real farms animals. However they have nothing in common with modern farming, even the not-inhumane ones.
BUT telling a 6yo toddler "look that cute cow, this is where your morning milk is from" will engrave it deep in the way they see farming. One day or another they will learn about factory farming but what you learn at 16yo doesn't "engrave" as easy and deep as at 6. I mean yes you quickly understand that education farms are not the reality but it require a big mental shift to overcome the feeling that the milk you drink in the morning is from an inhumane famr, especially when everyone around keeps doing it (I don't blame them, it's cheap, easy, convenient, traditional, delicious, practical...).
Some schools or parents brings their child in real farms which is a bit better, but it still doesn't depict the reality for 99% of consumption (think gelatin candies, croissants, cakes, ice creams...).
For the courageous -- DONT SHOW THAT TO YOUR TODDLER (yet) -- 8 hours of pigs in a typical/normal gas chamber that probably will end up in soap/jelly/bacon. : https://www.farmtransparency.org/videos?id=hg8cyu393v
You also get to see how the wild world works, and most fish would prefer to be taken by a skilled spear fisherman than have their face mauled off by a squid, at least as far as I could tell.
Unfortunately we live in a world with 9 billion people on it, which means we don't have the room to grow and harvest all our own food. In my opinion, that's the issue. Sourcing all our food "ethically" is basically not possible.
I'd much prefer to be producing and hunting my own food.
Maybe you see a normal farm and get to know the animals then see an actual factory where it is industrialized...