I consider Kanban one of the most difficult of all lean tools to implement and sustain, because it is about gaining agreement and the discipline of leader standard work. Expect to train over and over and over. People ARE smart and people DO care, it is important they understand the value of this routine, the why. In this case, Gloria and I would just need to double check for a few weeks that consumption did indeed result in a check mark (replenishment).
Once established as standard work, my wife can now simply replenish exactly what was eaten over the course of a week, no more, no less, no forecasting.
I've never been prouder of my lovely wife than when the supplier's truck pulled up and the freezer was empty. Tears streamed down my cheeks as she achieved what every good marriage should....just-in-time.