Feed your starter with semola rimacinata. I recommend using 20g of your regular started fed with 80g semola and 80g water, to make sure you have enough! You can use it at peak, but it doesn’t need to be at peak—inactive/discard works just fine.
Make a well with the flour on a clean surface.
Pour in hot water and add the starter to the center.
Mix and knead until a smooth ball forms. If it gets tough and dry, cover it with a bowl for 5 minutes—then keep kneading.
Wrap in plastic or store in a Ziploc and rest in the fridge for at least 4 hours, or up to 3 days.
Let come to room temp for 30 minutes before shaping (this just makes it a little easire to roll out when making flat ribbons).