How to ignore iPad auto correct recommendation?
This is a bit of a workaround, but what I always do is just delete the last letter and type it again. iOS recognizes this as an assertion that that's how you wanted to type the word, and won't give the suggestion again. 

Also, if you type a word and it gets corrected, the erase it and type it again, it won't correct you twice. 

Finally, it seems that if you type a word that isn't in the dictionary and ignore or erase the correction, it won't offer that correction again in that text field. You can try this by just typing the same "wrong" word a few times and it will stop correcting you. 

It's not exactly what you're asking for, but I find the autocorrect to be sufficiently intuitive for me. (As a matter if fact, I typed this on my iPhone with absolutely no regard for errors.)