I know it’s Mother’s Day but I’m thinking about grandmothers.  Actually, I’ve been thinking about grandmothers for the past couple of weeks.  Last week I wrote about Oma and Bella — two holocaust survivors who recreated all the dishes their mothers and grandmothers made for them as children from memory. Oma’s granddaughter, Alexa Karolinski, made a film about them as they cooked and told stories about their lives. She…