14 minutes ago, gfweb said:Good thoughts. Potatoes do have pectin.
I tried again last night ...cooked 20 minutes. Still a little chunky even with a more vigorous mashing. There is something going on here.
If it is to do with the calcium, you may have to cook them for a lot longer. Here, the water is really hard, so I end up simmering potatoes for a long time. My mashed potatoes were no good at all until I started properly cooking them for at least 30-45 minutes, until I can no longer pick them up by spearing them with a knife.