Hey - thanks for mentioning this. I've filed an issue at https://github.com/openculinary/backend/issues/24 - in short; RecipeRadar has crawled some tuna + teriyaki recipes, so you've uncovered a bug indexing those and making them searchable.
(I've added some debug SQL and output to the issue in case you're curious)
Substitutions (i.e. 'ingredient x OR ingredient y satisfy my constraints') are planned. I'm yet to fully spec the feature out and consider all the use cases, so I'll make sure that's one of them.
Update: the situation should now be improved; some recipe content has been re-indexed, and an ingredient parsing problem was discovered and fixed too.
There are still only three recipes that contain both tuna and teriyaki sauce appearing, so coverage could likely be improved further. But it's a start, I hope!
cans of tuna tuna can canned tuna can of tuna
(none of the above works)
AND
teriyaki sauce
OR
ketchup
?