Make vegetarian/vegan filtered views, not Categories
Vegetarian and vegan food aren't styles of cuisine like Chinese or Italian, rather they are subsets of these styles - vegetarian Chinese or vegan Italian. Conversely, many recipes from these styles are "accidentally" vego or vegan, like salt and pepper eggplant or gelato.
So it would be good if Recipes offered a filtered view that limit recipes shown to all those that do not contain meat, or all those that do not contain animal products, so that if I'm feeling like eating Vietnamese tonight, I don't need to scroll through either unrelated recipes containing meat, or unrelated recipes that just also happen to not contain meat.
It would also be good if after choosing one of these filtered views the selection was remembered, so when people re-launch Recipes they aren't presented with photos of meals that might well be off-putting or offensive.
This probably also goes for other "special needs" recipes like those that are allergen-free.