It was the letter Cersei made Sansa write to Robb, telling him their father was a traitor and asking him to bend the knee to Joffrey.

Just found out that the Calm app has "bedtime stories" read by Bronn / Jerome Flynn. You're welcome.

I think the jump cut to the chicken pot pie was meant to bring a little levity - because the scene was brutal. The cut was funny but the scene wasn't.