Right so I made well done steak for her last night and there was still half left so I just put it in a thin plastic bag (with its original packaging) tied a knot and put in the fridge thinking im make it again the night after with rice, initially it looked like it was going darker but only around the edges I just thought itās because it wasnāt air tight stored so being exposed just darkened the the outside as inside was still red - smelt it and was fine - I made it and started giving it to her she had about half of a medium slice and then I tried it just because I overcooked the outside and didnāt want to put it to waste, straight away I could taste it was so sour I immediately stopped giving it and made my husband try it as well he confirmed then smelt the bit that was uncooked in the packet and said it even smells sour but to me I expected gone off meat to smell really bad not sour! Now Iām panicking as she already has diarrhoea from teething and I donāt know how this will effect her please any advice or anyone experienced similar