Chicken soup with noodles or matzo balls are perfectly standard so why not potatoes? They sell gluten-free egg noodles made of potato starch, which are pretty terrible. Cubes of potato are a LOT better. Cubes of eggplant might even be better, and I don't like eggplant.
I know people who don't eat anything made with matzo meal during Passover, and they customarily put potatoes in their chicken soup. Why on earth not use matzo meal during Passover? Because the word we translate as "leaven" is not, technically, the same as yeast leavening. It's more like "what happens when you let wet flour sit around for more than 20 minutes before baking it." And there's flour in the matzo meal, so you shouldn't get it wet and let it sit around for more than 20 minutes. This spring, a local geek fed matzo meal to a sourdough starter. And the sourdough starter ate it, and went on to make perfectly good bread. I know 3 people who recoiled in horror and decided to stop eating matzo ball soup during Passover.
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I know people who don't eat anything made with matzo meal during Passover, and they customarily put potatoes in their chicken soup. Why on earth not use matzo meal during Passover? Because the word we translate as "leaven" is not, technically, the same as yeast leavening. It's more like "what happens when you let wet flour sit around for more than 20 minutes before baking it." And there's flour in the matzo meal, so you shouldn't get it wet and let it sit around for more than 20 minutes. This spring, a local geek fed matzo meal to a sourdough starter. And the sourdough starter ate it, and went on to make perfectly good bread. I know 3 people who recoiled in horror and decided to stop eating matzo ball soup during Passover.