I've had it on my 'early stages ideas' board for a while for an app that suggests replacement ingredients, groups of ingredients, or techniques. I often have so

I've had it on my 'early stages ideas' board for a while for an app that suggests replacement ingredients, groups of ingredients, or techniques. I often have something in mind to cook and then realise at the last minute that I have no parsley, white pepper, lemon juice (etc). Any thoughts on that?