Boiled cow tongue
Stuffed hearts
Boiled trotters
Tripe
Boiled (or later microwaved) marrow. I didn't mind stuffed marrow so much, but the tasteless, watery horror of marrow went on for months and months and months.
Kale. I quite like kale now, but as they grew their own it again went on for flipping months and was just boiled
Purple sprouting that managed to be both watery/mushy and tough/woody at the same time. Fortunatly the season for this didn't last too long
My parents ate (very) locally, seasonally, organically and low processed before it was a thing. As a child I did not appreciate the weaponised bread, runny yogurt, low sugar baking, and foraged goods (there really are only so many mushrooms or blackberries you can eat). Later I realised the ingredients and ethos were great, but my mums cooking and lack of time made the food largely terrible