Cooks sometimes add a small amount of baking soda specifically to intensify, not reduce, the dish's characteristic slipperiness.
Fresh okra is chopped and boiled down, sometimes with a pinch of bicarbonate of soda, into a deliberately slick, mucilaginous stew that's spooned over nshima. It's a polarising dish — locals either love the texture or avoid it — sold at nsima stalls around Ndola's markets.