You can index recipes as you go by creating recipe category boards or files. Instead of just having one called Recipes, instead try

Recipes Appetizers
Recipes Bread
Recipes Meat Poultry
Recipes Salad
Recipes Soups

Then all the recipe categories will sort together alphabetically. but can be more easily found according to topic.

If something goes well in two categories, you can double pin, double copy, or double tag to categorize.