Way too much lemon in my basting liquid Let me start by saying, I am a good home cook.
I have been cooking for a while with positive review. 

I decided to try something I had never done before.  I made a Greek Inspired Pork Roulade.  It required making a filling with spinach, cream cheese, feta, kalamata olives, artichoke hearts, lemon zest, and garlic.
I tasted the filling and it was great.  I pounded the pork to about 1/4 inch thin and spread the filling and rolled it into a Roulade.  I didn't have twine so I rolled it in parchment paper.  The final step was to baste the Roulade with mustard, lemon juice, garlic, and oregano sauce.
So, after baked it for 15 -20 minutes, I basted. Everything looked and smelled amazing, but looks and smells can be deceiving...it wasn't great!!
But, neither myself or my husband could finish it due to the tartness. 

Can anyone give me tips on how to fix this...I hate wasting food but can't seem to be able to figure this one out.
It won't look as nice, but it should be possible to rescue the flavour. 

As you've also got lemon in the filling, and feta is quite tart as well, I suggest you first remove the filling and dilute with extra cream cheese (and possibly olives and cooked garlic). Reheat enough  to have with the pork and chill the rest too have with something else within a couple of days.

Wipe the meat with kitchen roll (paper towel) while the filling is removed. If you're desperate you could even quickly rinse it (in boiling water if hot, chilled water if cold).

Then reroll and reheat, or serve deconstructed.