I didn't have potatoes, so I substituted rice.
I didn't have paprika, so I used another spice.
I didn't have tomato sauce, I used tomato paste;
A whole can, not a half can - I don't believe in waste.
A friend gave me the recipe; she said you couldn't beat it.
There must be something wrong with her, I couldn't even eat it!
When I was doing product development, I ran into the problem all the time: they tried something else entirely, called it the same name, and then went around saying it didn't work.
I've seen the same thing at this site time and time again. Someone says "the protocol" didn't work for them, and then, on closer questioning, you find they never really tried it at all.