Even a tiny one?
DH made a cottage pie last night, one of our family favourites. He always puts a tablespoon of Worcester sauce in (it was a big batch) but last night realised we'd run out so put soy sauce in instead as 'it's practically the same'. No. It's not. He even had to admit to himself that it tasted shit. 
It reminded me when mil made me a tuna and tomato sarnie and I nearly gagged because she'd added a massive dollop of english mustard in the tuna.