I had my friend and her 2 DCs 3/4 over for lunch. After lunch the DC wanted something sweet so I offered some frozen yogurt.
A few weeks ago I had some of those yogurt tubes which were about to go out of date before we could eat them so I froze them.
I went to give the DCs the opened frozen yogurt tubes when my friend noticed the date on them. She took the tubes from the DCs and throw them in the bin. She started saying that I could have made the DCs sick as the yogurt was out of date. I told her it was ok because it was frozen. My DSS's have eaten then before with no problems.
I thought you could eat stuff that was out of date if it was frozen before the use by date. My friend left shortly after this and has texted to say we should have lunch at her house as she only likes to feed the DCs safe foods. 
Wiu? Was I wrong about the tubes being safe to eat? Have a been unknowingly feeding my DSSs food that could make them ill?