teabagwoman, your MIL had one thing right whatever was on the plate: she never stood in front of the fridge at six o'clock wondering. MollyNew and M0nica have the modern version, a plan for the week that bends as the week goes on, and that's the part that saves the money and the waste, not the pie on a Wednesday. What works for households that like a plan but hate a timetable: the week's meals said once on Sunday, the shopping list built from them, and then swapped about freely, the ham salad pushed to Thursday because eggs on toast won. The back of an envelope does it, a shared note on the phone does it, an app such as XNeuronal keeps the week said out loud, reads the list back to you in the shop and reminds you on Tuesday night that the kidney has to come out of the freezer. Thai on Fridays if you're Sago, a fish finger butty if you're MT62. The routine is the planning, not the plate.