We got this book as a Christmas gift: https://www.amazon.com/Vegan-Everybody-Foolproof-Plant-Based...
It does a great job at the beginning of the book addressing various substitutes for things like eggs, mayo, etc... Since it's done by America's Test Kitchen, they've tested everything extensively, and explain which subs are the best for baking, flavor, and other factors.
Since it's produced by America's Test Kitchen, I'm more inclined to trust the recipes at face value with little modification. Other vegan cookbooks I have found require adjustments to get the flavor correct.
You really need to watch the show, as the sometimes they make assumptions that don’t make sense to me that drive the whole process. That isn’t captured in cookbooks. They get the best output based on the criteria set.
I like to think I’m a pretty good cook and okay baker and understand different egg substitutes and where and when to implement them based on the function of eggs in the recipe, but 99% of the time I’m left eating a sweet that turned out like total garbage.
But following recipes that are egg free from the start makes it more like 75% of the time it turns out great!
On the plant based side, I've had pretty good luck with Just Eggs for a lot of things; it's not perfect (won't work for a custard) but works pretty well for a lot of baking.
I’ve been tempted to try quail eggs, as the same Amish market has them as well. But besides being worried of suffering a similar fate as the duck eggs, or in a cruel twist of fate, I can tolerate quail eggs and am forever forced to use many tens of these mini eggs when following a recipe or making an omelette!
Just egg was such a great experience, I actually teared up when I ate my first bacon, ‘egg’ and cheese bagel. Such a cool product.
I also like the extension, I’ve been trying to cut out more animal-based products and I’m excited to try it out. I look forward to seeing how it will continue to develop!
We do plan on introducing chef tips and user-generated reviews of veganized recipes.
Currently the substitutes aren't specific to cooking style or type of food. It's tricky but not impossible. And we are on it!
Brand recommendations are important too. But maybe with user feedback and applicability. Most transitioning vegans don't know which cheese melts and which milk works best with coffee. And I think that's how our recommendations should evolve.
Not all recipes call for the same substitution for the same ingredient. And not everyone has the same philosophy about how to substitute.
For instance, eggs. There are several different uses for them in recipes; binding, leavening, moisture, protein content, etc. There are several different substitutions and most do some of those things better than others. Picking a good egg substitute, or choosing to simply leave the eggs out, requires knowledge and experience, or at least a flow chart.
There's enough of an art to it that I'd rather see how others solved the problem than consult a browser plugin that seems geared more to sell me stuff than to help me solve problems.