How do I correct a pantry figure?

Open the pantry (in an open list at the top via the title bar, or via „⋯“ → „Pantry“) and tap the fill ring on the product — choose „empty“, „¼“, „½“, „¾“ or „Full“.

This teaches pon the right amount: „Full“ resets freshness and shelf life, „Used up“ takes the product out. A swipe left hides a product from the pantry (it comes back on its own the next time you buy it).